Artemis II Fueling Operations

On April 1, 2026, ahead of the official launch broadcast, NASA aired its “tanking” show from L 11 through L 6. Hosted by NASA’s Antonia Jaramillo, the program provided step by step commentary and interviews as teams loaded propellant into the Space Launch System (SLS) rocket. Artemis II will send astronauts on a journey around the Moon, the first crewed lunar flyby in more than 50 years. This mission marks the first time humans will travel beyond low Earth orbit since Apollo 17 in 1972, carrying its crew on a historic voyage to the far side of the Moon and back.

What is said in the film

The Artemis two mission is a test mission of the Orion space capsule. Artemis two will be the first time we put humans on this rocket. We're going back to the moon because it's the next step in our journey to Mars. We were always going to the moon. Pushing ourselves to explore is just core to who we are.

That's a part of being a human. And lift up. We shall return. Continuing to test out every bit of Orion. Coming back to Earth.

Seven miles. Seven miles. When humanity sets big goals, we can bring together genius from around the world. You have the best people on planet Earth putting this vehicle together. That's what's up.

To innovate for the benefit of humanity and to inspire the world through discovery. And here we go. Good morning. From Firing room one at NASA's Kennedy Launch Control Center in Florida. You're looking at a live view of Launch Complex 39 B, or the SLS or Space Launch System rocket and Orion spacecraft are getting ready to lift off in a little over ten hours for the agency's Artemis two mission.

I'm Antonia Jaramillo. with NASA communications and I, along with my fellow commentators, will take you through today's launch countdown and the rest of this historic mission, NASA will be providing 24-7 live coverage, starting with our propellant loading operations, and will continue throughout the course of this ten day mission. Now, our Artemis launch director, Charlie Blackwell Thompson, gave the go to proceed with cryogenic propellant. Loading at 7:33 a. m.

Eastern time this morning, which means pretty soon, teams will start fueling the rocket with cryogenic or super cold liquid hydrogen and liquid oxygen. You can see on your screen there is a view of firing room one. That is where the Artemis launch team is currently on console and is getting ready to launch the SLS rocket and Orion spacecraft. Now, Artemis two is NASA's first crewed Artemis mission. This test flight will send NASA astronauts Reed Wiseman, Victor Glover, Christina Cook and Canadian Space Agency astronaut Jeremy Hansen on a ten day mission around the moon and back.

Now, the countdown for this mission started on Monday, March 30th at 4:44 p. m. Eastern time. One thing to note about the countdown clock that you see on your upper left hand side of your screen there is. You're going to hear us refer to what are called L minus times and T minus times.

Now, the reason we have these two different references for the countdown clock is because the L refers to how much time is left until the opening of our launch window, or until launch. Think of it like the regular time that you see on your clock. Always constantly ticking down. The T clock, however, is specific to the actual countdown. Similarly to when watching a sporting games event, when you see the clock on the screen, stop when the referee blows a whistle, for instance.

The same thing can happen with our t clock. And the reason that is, is because the launch team has inserted specific built in hold throughout the countdown. Now, these built in holds are pauses that the team has intentionally inserted in the countdown to provide them with some extra wiggle room or some cushion to to again, just be able to go through all of their operations continue. Making sure that everything is on track to be able to meet the opening of that launch window. And also, if they run into any issues throughout the countdown.

This also provides them that extra time to be able to resolve them and still make again that opening of that launch window. Now let's talk about today's launch window. The launch window is two hours long. It opens at 6:24 p. m.

eastern time this evening. Now, what does that mean? A two hour launch window. It means that the launch team has two hours in which they can launch. Launch today's Artemis two mission.

So if we don't go right at 6:24 p. m. , that is okay. So again, to quickly recap, our launch director gave the go to start our cryogenic propellant loading operations. That means right now, the Artemis launch team is currently in what is called the chilled down phase for the SLS core stage rocket.

Now, the core stage is the first stage of the SLS rocket. It is the orange section in between the two solid rocket boosters that you see there on your screen. Now Chill down basically refers that we are going to be cooling down all the systems and lines that are that will be feeding this propellant inside the rocket. The reason we chilled down these lines is because we are feeding cryogenic or again, super cold propellant on board liquid hydrogen. To remain in a liquid state needs to be -423°F.

On the oxygen side, it's -297°F. So very, very cold temperatures. Because of this, we then cooled down these lines so that they don't so that we aren't shocking the system we are in, causing any potential damage to the hardware. And they're able to receive these super cold propellants smoothly and without issues. So again, we are currently in chill down for both the core stage liquid hydrogen and liquid oxygen tanks following chill down.

The teams will then start what is called slow fill. This will officially mark the start of propellant loading. That means that we will actually start loading that liquid propellant on board the rocket. Now, as the name suggests, slow fill basically refers to slowly start to load that propellant. The reasons they do this is because the teams are wanting to closely monitor that there isn't any leaks or any issues.

When we are starting our propellant loading operations. Now, following slow fill, teams will then transition into what is called fast fill. Similarly to how slow fill refers to going slowly, fast Bill means we're going to go at a much faster rate. This will be the bulk of our propellant loading operations, where teams are going to be in fast fill for the majority of the time. Now, following fast fill, we will then transition into topping.

Topping just means that we are going to finish that last little bit that is needed to get us to 100% level in those tanks. Now, because these are our gases, these are liquid gases. As the temperatures start warming up, those gases will, that liquid oxygen and liquid hydrogen will start venting off into a gas. Because of this, following topping teams will then transition into what is called replenish mode. Replenish means just that.

They're just going to constantly be replenishing these tanks so that we make sure we're at 100% level and we are at that flight ready level for when we enter terminal count. Now, I'll be reporting out as each of these operations and milestones are underway. Our Artemis launch team, they're currently communicating with each other through these separate communications channels that I'll be tuning into. And I'll make sure to relay as that information gets underway. And they report those milestones and call outs out.

Now, while we wait for slow fill to get underway, let's do a little bit of a recap of the entire countdown. Again, we said we started on Monday at 4:44 p. m. eastern time. So shortly after the countdown started, ticking down, teams filled the water tank for the sound suppression system.

Now, this is done to help protect the rocket and the supporting ground structure structures that are there at the launch pad from the extreme heat and the power that's generated from the rocket's exhaust. And it also helps suppress the sound that's produced at liftoff. Now, the Orion spacecraft, the core stage, which, again, is that first stage of the SLS rocket and the Interim Cryogenic Propulsion Stage, or the upper or second stage of SLES, were also all powered up for launch. The Orion and the core stage flight batteries have been charged, and at 4:14 a. m.

eastern time this morning, team started what is called the air two gaseous nitrogen or Jian two changeover. Now this is a very important milestone to meet our launch director technical assistant Maddie Forrest. Dale kind of described it to us. It's when we're really getting ready to get the party started. The reason for this is because it basically signals the team that we are on track to be go for propellant loading later in the countdown.

And the reason for that is because the air to gaseous nitrogen change over basically is helping prevent any potential fire hazards. It's a creating a clean and nurture environment inside the vehicle so that then when we are putting in those hazardous propellant, there aren't any issues. So that started at 450 4:14 a. m. this morning, and it was completed at 7:14 a.

m. Eastern time. Now, as I mentioned earlier, the countdown for Artemis two does have certain built in holds throughout the count. We are currently in our first built in holds, which lasts two hours and 45 minutes total. Like I said, we're still currently in it and we do have roughly about 38 minutes and counting until we exit that first hold.

The other additional built in holds that have been put in the countdown. Again, these are pauses that the team has purposely inserted to make sure that they can just get some extra cushion time if needed. That next one happens once we reach what is called all stages replenish. Now, all stages replenish just means that now the entire SLS rocket is fully fueled and teams are now just constantly replenishing all the tanks to make sure that it is always at 100% until we get into the final ten minutes of the countdown. So when we reach all stages, replenish.

That's when the teams are going to be ready to send our astronauts to the launch pad. Because of this, the teams have inserted this extra hold. It's an hour and ten minutes that will happen again when we are at all stages. Replenish. Following that, we then have just one final hold in the countdown, and that happens when we're then getting ready for terminal count.

It'll be a 40 minute hold, and it will happen roughly again about 40 minutes before we enter. Then the last ten minutes of the countdown. So to quickly recap again, our launch director, Charlie Blackwell Thompson, she gave the go for teams to start propellant loading. We are currently in chill down for the core stage liquid hydrogen and liquid oxygen. Up next will be slow fill when we start loading that liquid propellant.

And I will report out when that is underway. Welcome back. This is Artemis launch control. For those of you that are just now joining us, this is our NASA live coverage for the Artemis two mission. We are starting our propellant loading operations, and we'll be giving you 24 over seven live coverage, starting with our tanking operations and continuing throughout the rest of this mission.

We're here in Firing Room one. You can see there on your screen. We have our Artemis launch team getting ready to launch the SLES or Space Launch System rocket and Orion spacecraft for the agency's Artemis two mission later this evening. Now, that launch window opens at 6:24 p. m.

eastern time today. The team do have a two hour launch window, which means that if we don't launch right at 6:24 p. m. , they do have an additional two hours in which they can launch. Now, as you can see, it is a gorgeous, bright and sunny day here on the Space Coast in Florida.

Currently, you don't see any clouds inside, but I can confirm there are some pretty white puffy clouds. They don't seem to be a threat. In fact, our launch weather officer. He told the launch team that they have favorable and acceptable weather, not only for tanking, but also throughout today's countdown. Now, the teams will continuing to monitor the weather forecast as they as we get closer to today's launch window.

We're currently predicting 80% favorable weather conditions for that two hour launch window. We are currently ten hours and 17 minutes and counting from the opening of the Artemis two mission. We are currently in what is called our chill down operations for the core stage, liquid oxygen and liquid hydrogen tank. Now, Chill down refers to getting all the systems and lines very cold and ready to receive these super cold cryogenic propellants prior to starting our actual tanking loading operations. Now let's break down the SLS rocket.

We start with the core stage. That is the first stage of the rocket. Then on top of the core stage, you have what is the upper stage or that interim cryogenic propulsion stage. So in total for SLS there are two stages, but there are four tanks in total. You have our liquid hydrogen tank on both the core stage and the upper stage, and a liquid oxygen in both.

So four tanks total both liquid hydrogen and liquid oxygen. The core stage holds roughly 733,000 gallons. The upper stage, meanwhile, holds 24,000, so much smaller in comparison. In fact, the core stage is one of the tallest stages first stages of a rocket that NASA has ever used for its missions. It's roughly 212ft tall.

Now fully fueled, SLS weighs approximately 5. 74 million pounds before fueling, which is where we're currently at. It is 3. 5 million pounds. So that means we're adding roughly 2.

25 million pounds of propellant onboard this rocket. That's quite a lot. Again, to quickly recap, we are in chill down. The next step will be when we enter. Slow fill.

Slow fill refers to when we actually start those propellant loading operations. Teams will start to slowly load those cryogenic propellants on board the core stage. And then we will start transitioning where we going a little bit quicker. We call that fast fill. So we will start flowing that propellant at a much faster rate.

I'll continue reporting out as these milestones are underway. Now on the spacecraft side, teams also have started what is called the Orion Cold Soak. Now this basically refers to making everything super cold on the spacecraft. This is done in order to protect the avionics. So we're not chilling the crew module, but we're making the thermal control system cold so that it can withstand all of the different temperatures that it's going to be seeing throughout today's countdown.

That started quickly after we gave the load go for cryo load. Now Artemis two is a test flight. We're going to send astronauts Reed Wiseman, Victor Glover, Christina Cook and Jeremy Hansen on a ten day mission around the moon. This is the first crewed test flight for NASA's Artemis missions. And we're going to be testing the life support systems that are onboard Orion.

As well as conducting other operations and demonstrations throughout the mission, so that we can pave the way for our future Artemis missions. When we send our astronauts to the moon. In fact, one of the new operations or the new demonstrations at the hour our astronauts will get to perform throughout this mission is what is called the Proximity Operations demonstration. So after launch, after the upper stage, this will be roughly about 50 minutes after launch. The upper stage is going to fire its RL ten engine.

It has one RL ten engine at the bottom. It will fire its engine so that it starts a 32nd perigee raise maneuver burn. This is going to put the spacecraft or the Orion spacecraft, this low point on its elliptical orbit as it's going around Earth. About an hour later, the upper stage will fire its engine again to begin a 20 minute apogee raise burn, in which point we're going to be sending the spacecraft to its highest point in its elliptical orbit around the Earth. Earth.

Now roughly three hours and 25 minutes into the mission. So this is about, again, 3. 5 hours after launch. Orion will separate from the upper stage at this point. This is when our astronauts, our crew on board, they're going to begin manually testing Orion's can controls and steering thrusters so that they can start what is called this proximity operations demonstration.

This is basically a series of maneuvers that are going to have the Artemis two crew flying Orion, and practice approaching the upper stage and backing away for roughly 70 minutes. Now, the reason we're doing this test is so that, again, we can practice this for when we go and have Artemis three, and we actually have Orion practicing docking with our lunar landing systems. Now, it is important to note that Orion won't actually dock with the upper stage for Artemis two. Instead, it will get close and then drift, and then go back and separate and then get close again. We really just want to practice those proximity operations to confirm we can do it.

We can. The spacecraft can get aligned with where it needs to be. And then following that, Orion will then fire its European service module engine for about two minutes so that it helps increase that separation distance from the upper stage. At this point, the upper stage will fire its thrusters just one final time so that it begins its disposal burn. Following that burn completion, that's when the small breadbox size or those shoebox size secondary payloads that are currently inside the Orion stage adapter.

If you see on your screen there up at the top, we have our Orion spacecraft. And then underneath there will be the Orion stage adapter that is in between the upper stage and the spacecraft. It is where we currently house those secondary payloads. These are what are called a bunch of CubeSats. These are some science experiments that are being housed there.

And then they will separate with the upper stage. And go to their respective destinations to conduct their scientific data. Now, again, following on, once those are ejected from the Orion stage adapter, that's approximately 5. 5 hours into the mission. The upper stage will then send, will then go back on its trajectory and will reenter over the Pacific Ocean about 26 hours after launch.

Now, during this time, the Orion will remain in a high Earth orbit for about 25 hours before it executes its trans lunar injection burn. Now, this is the burn that is needed so that it can head on and send our four astronauts around the moon and back. So that's just a little quick recap of what our next day looks like within the next 24 hours. But let's take you back to where we currently are at. Again.

We are ten hours and eight minutes and counting from the opening of today's launch window. That launch window opens at 6:24 p. m. Eastern time. We are currently in what is called chill down for the core stage liquid hydrogen and liquid oxygen.

Next up will be slow fill when we start loading that liquid propellant, and I'll report out once that is underway. Welcome back. This is Artemis launch control. We are currently nine hours and 49 minutes and counting until the opening of today's launch window for the Artemis two mission. Now, that launch window opens at 6:24 p.

m. eastern time this evening. Teams do have a two hour launch window, which means that if we don't open right at the start at 624, they do have an additional two hours in which they can try to launch the Artemis launch team, which we see here on our screen. They are getting ready to they are sitting on console, getting ready to launch our Artemis two moon rocket. Now, the launch team just reported that we are now starting our propellant loading operations for the SLES or the Space Launch System rocket.

We are currently in slow fill for both the core stage liquid hydrogen and liquid oxygen tanks. This means that propellant loading is officially underway. We are now starting to load those super cold, these cryogenic temperatures onto the SLS rocket. Now we're going to start from the bottom and make our way slowly up to the top. So we'll first start with loading the first stage of the rocket.

That's what we call the core stage. It is the orange section of the rocket that you see there on your screen that sits between the two solid rocket boosters. Now we are currently again in slow fill for both liquid hydrogen and liquid oxygen on that core stage. Slow fill refers to, as the name suggests, to slowly start loading that propellant. Now we do this because these tanks are really large.

In fact, the core stage is one of the tallest first stages of a rocket. So that means these tanks are also very, very large. In fact, the liquid hydrogen tank on the core stage can hold roughly 537,000 gallons. And then on the liquid oxygen side, it holds roughly 196,000 gallons. So because of this, because these tanks are so large, teams will start slowly loading this propellant so that they can monitor how the tanks, how the hardware is receiving these super cold cryogenic propellants.

Once it looks like everything is under way and there are no issues, they will then transition into what is called fast fill, which is where we'll stay for the majority of our tanking operations. Fast fill means we'll now start loading the rocket at a much faster rate. Now, before the rocket is fueled, SLES weighs approximately 3. 5 million pounds, but fully fueled its 5. 74 million pounds.

And we are starting to fuel that rocket. So it is going to start getting heavier and heavier. Now, we mentioned how the core stage that is the largest segment of the SLS rocket. In fact, it's one of the tallest first stages of a rocket that NASA has ever used. It's roughly 212ft tall.

Now, on top of it sits the upper stage or the interim Cryogenic Propulsion stage. Now that's roughly 45ft tall in comparison. And then on top of that, you have what is called the Orion Stage adapter. It is actually the smallest part of the SLS rocket, and it is what holds our cubesat. These are these shoe box sized payloads are the scientific payloads that will be sent off into space following the separation of the upper stage from the Orion spacecraft.

Now, it is the smallest part of the rocket at only roughly five feet tall. And then, of course, on top of the Orion stage adapter sits our Orion spacecraft. You can see there on your screen the Orion spacecraft that's on top. And then right there where we have our Artemis logo. That is what is actually called the Crew Access Arm.

It is part of the mobile launcher that is the gray L-shaped structure that is connected to the SLS and Orion spacecraft. The rocket. Now the crew access arm is very important as again, that name suggests, it is the access point for our astronauts or really any personnel to be able to access the spacecraft. So that is where in fact our astronauts Reed Wiseman, Victor Glover, Christina Cook and Jeremy Hansen, they'll be walking through there later on today when they are ready to board their spacecraft for their mission around the moon. So to quickly recap, we are now in slow fill for both liquid oxygen and liquid hydrogen on the core stage.

That is again the first stage of the SLS rocket. Following that, we will transition into fast fill and I'll report out when that is officially underway. Now while we wait to get into Fast fill, these are currently not monitoring any any big issues in the countdown. It's actually been things have been going really smoothly, fairly well. We are definitely hoping for things to continue that way.

But let's talk a little bit about what how everything that the teams had to do to get us to this point. So teams first rolled the SLS rocket and Orion spacecraft to the launch pad for the first time on January 17th. Then on February 2nd, teams performed a wet dress rehearsal. Now, this was a rehearsal to practice loading the propellants on board the rocket, getting into terminal count but not actually launching. So it was like a practice test before launch.

During that first wet dress rehearsal in February, we experienced the hydrogen leak, which following that test teams then decided to perform another wet dress rehearsal. They did so on February 19th and it was very successful. They didn't really see any hydrogen leak throughout the entire account, or any other leaks for that matter, and they were able to continue throughout all of the milestones that they had planned. Now, we did have to roll back on February 25th due to a helium issue that we saw on the upper stage of our rocket. Teams, and noticed that the flow of helium to the upper stage was interrupted and on, and that meant that we had to roll back to the Vehicle Assembly building to help fix to fix that issue.

The only way to access that area was inside the VAB. Teams did successfully fix the issue inside the Vehicle Assembly Building, and we were then ready to roll back to the launch pad on March 20th. Since then, the teams have been getting the rocket then ready for launch, and we entered our launch countdown on Monday at 4:44 p. m. Eastern time.

And we are currently nine hours and 41 minutes and counting from the opening of today's launch window that opens at 6:24 p. m. and teams do have a two hour launch window, which means that they have two hours in which they can launch starting at 624. We are currently in slow fill for both the core stage liquid hydrogen and liquid oxygen tanks. Next up will be fast fill and I'll report out when that is underway.

Welcome back. This is Artemis at launch control. We are currently nine hours and 37 minutes and counting from the opening of today's launch window for the Artemis two mission. Now, our launch window opens at 6:24 p. m.

eastern Time, and teams do have a two hour launch window, which means they have two hours in which they can launch the SLS or Space Launch System rocket and Orion spacecraft that will send four astronauts around the moon and back. Now the Artemis launch team, they're currently in firing room one like you see on your screen. There they are right now, in the process of loading cryogenic or super cold liquid propellant onto the SLS rocket. We are now in our fast fill operations for the core stage liquid oxygen tank. This means that we just completed the slow fill on that tank, and we have now transitioned into fast fill, which means we are now starting to load liquid oxygen at a much faster rate.

Now on the hydrogen side, we are still in slow fill for liquid hydrogen. So slow fill for liquid hydrogen. Fast fill for liquid oxygen on the core stage. Now just to throw some numbers at you guys. Again.

The hydrogen tank on the core stage holds roughly 537,000 gallons. The liquid oxygen tank, meanwhile, holds roughly 196,000 gallons on the upper stage. In total, that's also another 24,000 gallons. So we have four tanks, over 750,000 gallons of liquid hydrogen and oxygen that is being fed all to these engines, to the four Rs 25 engines at the bottom of the core stage, and the one RL ten engine that's at the bottom of the upper stage. And now why do we need so much propellant?

Because we're sending our astronauts around the moon. We are going into deep space. We're going farther than we have since our Apollo missions in 1972. Now, again, all of this liquid propellant feeds the engines that are at the bottom of those stages for this tremendous and magnificent rocket that we see out there on the pad. In fact, in total, SLS is roughly 322ft tall.

It's taller than the Statue of Liberty. And it will send our astronauts around the moon. We have our commander, Reed Wiseman, pilot Victor Glover, and mission specialists Christina Cook and Jeremy Hansen. You can see them there on your screen from left to right. You have Victor, Jeremy, Christina and Reed.

They'll be getting ready to start their day and get on board their rocket for their mission around the moon. Now, Artemis two is a test flight. This is the first crewed test flight of the Artemis missions. We're going to evaluate the crewed system performance in a deep space environment. We'll perform a flyby around the moon.

We'll practice a proximity operations demonstration with the upper stage. All in preparation for our future Artemis missions. For when we land humans back on the lunar surface. So to quickly recap of where we are in today's countdown. We are currently underway in our fast fill operations for the liquid oxygen tank on the core stage.

That is the first stage of the SLS rocket, and we are still in our slow fill operations on the liquid hydrogen side, on the core stage. I'll report back once we have started fast fill for that liquid hydrogen tank. This is Artemis launch control. If you are just joining us, we are currently nine hours and 23 minutes and counting from the opening of today's launch window for the Artemis two mission. I'm Antonia Jaramillo and NASA communications, and I, along with our fellow commentators, will be taking you through the rest of today's launch countdown, as well as the rest of the Artemis two mission.

NASA will be providing 24 over seven live coverage, starting with our propellant loading operations that is currently underway and will continue all the way through our splashdown operations. Now, the Artemis launch team, what you just saw there on your screen, they are in the process of loading cryogenic or super cold liquid hydrogen and liquid oxygen onto the SLS or the Space Launch System rocket. That's a view of the rocket right there at Launch Pad 39 B, where it will lift off for the agency's Artemis two mission. Now, Artemis two is a test flight. We will be sending our astronauts Commander Reid Wiseman, pilot Victor Glover, and mission specialists Christina Cook and Jeremy Hansen on a ten day mission around the moon and back.

Now we are currently again underway with our propellant loading operations. We are in what is called slow fill for the core stage liquid hydrogen tank and fast fill for the liquid oxygen tank. Now, slow fill refers to slowly loading that propellant. This is done so that teams are monitoring how the hardware is receiving this super cold, hazardous propellant that is being onboarded on the rocket. On the rocket following slow fill that then transitions into fast fill.

When we start loading that propellant at a much faster rate. So oxygen is currently already in fast fill, and liquid hydrogen will soon follow suit. Now you can see there on your screen on the rocket there is a you can see maybe some little like checker marks that look to be on the solid rocket boosters. Those are the two nose cone shaped boosters in between, on either side of the core stage. Now, what do those black and white checkerboards and squares and circles means?

Well, these are our photo Graham metric markings. They serve. They serve as imagery references for the engineering photo and video documentation as, for the post-flight analysis of how SLES attitude and its position relative to the, the ground structure during liftoff and ascent performed. So that they're not just on there randomly. They do serve a purpose.

And it is, again, for all of that post-flight analysis. Now let's take it back over to the firing room, and let's take a look at our launch team. You can see there you have Charlie Blackwell Thompson. She's right now walking around on the first upper level road. She is our Artemis launch director.

She's currently wearing a green blazer. And you might see some other folks around the room also wearing green a lot. Why green? Well, at NASA, we love our superstitions. And we love our traditions.

And for the launch team. Green is one of those, fun traditions that they like to carry on. Green for them means go. So they wear green for good luck. Now the launch team, they communicate with each other via these communication channels to update how we are in the countdown.

I'll be monitoring those loops and I'll report out as each call out is made. The team actually just reported that we have now transitioned from slow fill to fast fill on the core stage liquid hydrogen tank. This means we are now in fast bill for both liquid hydrogen and liquid oxygen. Now following fast fill, teams will then transition into what is called topping. Topping just refers to finishing up the last little bit that is needed to get to 100% level on both tanks.

Once we finish topping, we will then enter what is called replenish mode. And this means that the teams are just constantly replenishing these tanks to maintain 100% flight level. This is done because as the temperatures of these liquid propellants naturally warm up throughout the countdown, they will start venting off into a gas state. And so because of that, the teams want to constantly be replenishing the tanks so that they're not losing any propellant. And we're going down from that 100% level.

So again, we are now in fast fill for both core stage liquid hydrogen and liquid oxygen. On the upper stage, meanwhile, we haven't started our propellant loading operations. There. I will report out once that process is also underway. Teams will first start with chilling down the upper stage liquid hydrogen tank.

And because the upper stage is so much smaller than the core stage, it actually gets to skip a step in its propellant loading operations, and it goes straight from chill down to fast fill. And really, this is done again because of the sizes of these tanks on the core stage. You have the liquid hydrogen tank that fits roughly 537,000 gallons of liquid hydrogen. The liquid oxygen tank, meanwhile, holds roughly 196,000 gallons in total. That's about 733,000 gallons on the core stage alone.

On the upper stage, meanwhile, the total amount of propellant is roughly 24,000 gallons. So significantly smaller. And because of this, they are able to go straight from chill down into fast fill. Now again, we have not started our propellant loading operations on the upper stage, also known as the Interim Cryogenic Propulsion Stage. I'll report out once that process is underway.

But to quickly recap, we are in fast fill for the core stage. Liquid hydrogen and liquid oxygen. Now, all of these tanks on both the core stage and the upper stage are going to feed the engines underneath those both stages. On the core stage, there are four Rs 25 engines. You see them there on your screen right there.

So both the liquid hydrogen and the liquid oxygen tank, they feed those four Rs 25 engines that start at roughly T -6. 36 seconds until liftoff. That's when they get ready. And then on the upper stage, the liquid oxygen and liquid hydrogen tank feed that one RL ten engine. Now, combined with the solid rocket boosters, SLS produces roughly 8.

8 million pounds of thrust. In total, it is 322ft tall, taller than the Statue of Liberty. In fact, let's break down the rocket for you a little bit. So up there at the top, we have our Orion spacecraft. Right underneath is actually then what is called the Orion stage adapter.

That's when the SLS rocket actually starts. The Orion stage adapter is the smallest portion of the rocket, roughly five feet tall. Underneath that is then our upper stage. Or that interim cryogenic propulsion stage. Then you'll see this nose cone orange shape underneath.

That's the launch vehicle stage adapter. It's actually enclosing part of that upper stage for protection. Underneath the cone shaped structure is our core stage. That is the first stage. It has that pretty butterscotch color.

And that is due to the thermal protection system, the foam that is used to again, protect the rocket. On either side of the core stage are the two solid rocket boosters. And then down right at the bottom are the four Rs 25 engines. All right. So we are in fast fill again for core stage liquid hydrogen and liquid oxygen.

I'll report out when the next milestone is underway and when we start our upper stage loading operations. This is Artemis launch control. We are currently eight hours and 58 minutes and counting from the opening of today's launch window for the Artemis two mission at. Launch window opens at 6:24 p. m.

eastern Time later today. Teams do have a two hour launch window in which they can try to launch. So if we don't launch right at 6:24 p. m. , that is okay.

You're looking at a live view of our Artemis launch team. They are in the process of loading liquid propellant onboard the SLS or the Space Launch System rocket. We're currently in the process of loading liquid hydrogen and liquid oxygen on the core stage of the SLS rocket. Now, the core stage is the first stage of that rocket. You can see there on your screen it is the orange section in between the two solid rocket boosters.

That's actually a great view of our rocket at Launch Pad 39 B. I mean, you can see it is a beautiful day. We have some puffy white clouds, blue skies. All in all, very favorable weather. In fact, our launch weather officers, they've been predicting 80% chance of go for our launch window this evening.

Now they're at the bottom of the rocket are our four Rs 25 engines. Each. Engines are roughly the size of a compact car. The solid rocket boosters. Those are the two white rocket boosters.

And on either side of the core stage, each booster is taller than the Statue of Liberty, and they also hold the entire weight of the rocket. Now fully fueled, SLS weighs 5. 74 million pounds. And again, you can see on your screen you might see some, some gas that's being vented off underneath the, the rocket and the mobile launcher. The mobile launcher is that gray shape structure that is connected to the rocket.

It's essentially what is providing all of the power the propellant, the coolants, everything, all the access point to keep the rocket in the spacecraft alive and functioning and running until it is ready for launch. Now that gas that you're seeing being vented off, it doesn't mean we're getting ready to lift off any time soon. It's just that natural boil off that is coming from the propellant that is being fed to the rocket as it naturally warms up over time. So totally normal. We expect to see it.

You'll probably expect to see it some more as we actually transition and continue with our propellant loading procedures and move forward into the upper stage, which is that second stage on top of the core stage, also known as the Interim Cryogenic Propulsion Stage, when we also start loading propellant on board that second stage, you might also see some gas also starting to, vent off at that higher level. In fact, you see there on your screen is a nice, better, closer up view of the upper stage. And then our Orion spacecraft up on top. Now let's take you to a graphic of where we currently are in our tanking operations. You see there on your screen on the left hand side, it will tell you how far we are in our core stage.

Loading operations. We're currently 28% of the way filled in liquid oxygen, and about 30% of the way filled for the liquid hydrogen side. Meanwhile, for the Interim cryogenic propulsion stage, that upper stage, you see, it's all grayed out there because we haven't begun that, propellant loading operations. I'll report out once that is underway. But for right now, we're just focusing on the core stage.

Now, in the meantime, while the launch team is right now starting to feel that fuel, the rocket and that propellant loading is underway. Our astronauts are getting ready to wake up and start their day. As a reminder, we will be sending four astronauts around the moon and back. Commander Reid Wiseman, pilot Victor Glover, and mission specialists Christina Cook and Jeremy Hansen will go on a ten day mission around the moon. Artemis two is a test flight.

Where we are going to test the life support systems with our flight crew on board. This is NASA's first crewed Artemis mission, and it will pave the way for our future Artemis missions. For when we land humans back on the lunar surface. So, to quickly recap, we are in fast fill for our core stage liquid hydrogen and liquid oxygen, and I'll report out once our upper stage propellant loading operations are underway. This is Artemis launch control.

We are currently eight hours and 45 minutes and counting from the opening of today's launch window for NASA's Artemis two mission. Now, that launch window opens at 6:24 p. m. eastern time. And teams do have a two hour launch window, which means that they can try launching within those two hours if they are unable to hit it right at the start.

At 624. Now, the Artemis launch team is currently loading super cold or cryogenic liquid propellant onto the SLES or Space Launch System rocket. We're currently in our fast fill operations for the core stage liquid hydrogen and liquid oxygen tanks, and the teams just reported that they are also now starting their chilled down operations for the liquid hydrogen tank on the upper stage, or that second stage of the SLS rocket. You can see a great view of it there on your screen. It sits right up on top of where you have the, the nose cone shape structure that's orange up on top.

There is a portion of that upper stage, also known as the Interim Cryogenic Propulsion Stage. And then if you're curious, the, nose cone shaped, structure shape that is called also the launch vehicle stage adapter. It is a part of the rocket. And it is enclosing also a portion of the interim cryogenic propulsion stage. This is done for protection.

So you don't see the engine. That's underneath that second stage. But it is underneath there hidden behind the, the launch vehicle stage adapter. So again, we are now starting our chilled down for the liquid hydrogen on our upper stage. Following that, we will then transition into fast fill for liquid hydrogen on the upper stage.

Meanwhile, on the core stage that is the first stage of the rocket fast fill is already underway. There's a great profile shot, so right underneath that nose cone shape is then that cylinder orange structure. That is the core stage. It is one of the tallest first stages of a rocket that NASA has ever used for any mission. It's roughly 212ft tall.

In fact, in total, the SLS rocket and Orion spacecraft sit at roughly 322ft tall. Now I'll report out once chilled down is complete on the upper stage, and we have transitioned into fast fill. As a quick recap. Artemis two is scheduled to launch no earlier than 6:24 p. m.

Eastern Time this evening. Teams do have a two hour launch window. And this mission will be sending four astronauts around the moon and back. We'll be sending NASA astronauts. Read Wiseman, Victor Glover, Christina Cook and Canadian Space Agency astronaut Jeremy Hansen on a ten day mission.

They actually just got the go not too long ago to actually start waking up and officially start their launch day. Now that's a great view of our SLS rocket at Launch Pad 39 B up. We just switched it. But as you saw there, it's a gorgeous day here on the Space Coast. We have some beautiful blue skies, some puffy white clouds.

Our launch weather officers are predicting 80% chance of favorable conditions throughout our two hour launch window. Now, of course, if there are any changes or updates, we will make sure to provide those to you. In fact, NASA will be providing 24 over seven live coverage of this entire mission, starting with our propellant loading operations, which is currently happening and will continue all the way through our splashdown procedures. You can see there on your screen how to watch. Now lasting approximate approximately ten days, Artemis two will send four astronauts to test the Orion spacecraft and a high Earth orbit before becoming the first astronauts to fly around the moon since the Apollo 17 crew in 1972.

Again, we are in fast fill for core stage liquid hydrogen and liquid oxygen, and we are in chill down for the liquid hydrogen tank on our upper stage or interim cryogenic propulsion stage. Good morning from Florida Space coast. This is Artemis launch control. We are currently eight hours and 30 minutes and counting from the opening of today's launch window for NASA's Artemis two mission. I'm Antonia Jaramillo and NASA communications.

And if you're just joining us, the Space Launch System, or SLS rocket is in the process of of cryogenic propellant loading. That means the launch team that is currently in firing room, one that you see on your screen there are loading the cryogenic or super cold liquid hydrogen and liquid oxygen on the SLS rocket, fueling it for flight. Now, the team just reported that we have now started our fast fill operations on the liquid hydrogen tank on our upper stage of the SLS rocket that is also called the Interim Cryogenic Propulsion Stage. It is the second stage of our SLS rocket. You have a great view of it there on your screen, up at the top of you.

See you have the Orion spacecraft underneath. There will be then actually the smallest section of the SLS rocket known as the Orion stage adapter. And then quickly and then shortly underneath that is our interim cryogenic propulsion stage. Now teams are now starting the fast fill operations for liquid hydrogen. Now, fast fill, as the name suggests, means that teams are just loading this propellant at a faster rate.

Now, following the liquid hydrogen operations on the upper stage, teams will then also work on then their propellant loading operations for the liquid oxygen tank that is also in their. In total, the SLS rocket has four tanks, two liquid hydrogen and two liquid oxygen. One of each on each stage. So you have there our upper stage or the interim cryogenic propulsion stage. And then underneath sits the core stage.

That is the first stage and the main stage of the SLS rocket. It is the orange segment that you see there on your screen in between the two solid rocket boosters. We are also in our fast fill operations for both liquid hydrogen and liquid oxygen on the core stage. So fueling is well underway. And everything is looking good so far for that.

For our two hour launch window that opens at 6:24 p. m. eastern time this evening. Now, Artemis two is scheduled to lift off from Launch Complex 39 B. That's what you see there on your screen.

That's where SLS is currently situated. And it is a gorgeous day here on the Space Coast. We have some beautiful white clouds, some beautiful white puffy clouds and some clear blue skies. We're looking at 80% chance of favorable weather conditions. And our astronauts that are getting ready to launch on this historic mission are now starting their day.

They woke up not too long ago. And will pretty soon go through all of the checkouts and steps that are needed before they're ready to get on their rocket. There's a picture of them on your screen there. From left to right, we have the pilot, Victor Glover. Then you have our mission specialist, Jeremy Hansen.

And right next to him is our other mission specialist, Christina Cook. Next to her is then our commander, Reid Wiseman. These four astronauts will go on a ten day mission around the moon and back onboard the Orion spacecraft. A fun fact you see, again there we were talking a little bit about the different sections of the rocket, and we mentioned briefly the Orion stage adapter. Now the Orion stage adapter is the, the last section of the SLS rocket.

It's what sits in between the interim Cryogenic propulsion stage and the Orion spacecraft. And it's also what houses our secondary payloads or these shoe boxes. CubeSats that will be providing and conducting scientific experiments. They'll be deployed shortly after separation from the upper stage and the spacecraft, and they will go to their specific destination in space. To conduct scientific data.

Now inside the Orion stage adapter. Fun fact our astronauts. So read Wiseman, Victor Glover, Christina Cook, and Jeremy Hansen. They actually got the opportunity to sign the interior of the OSR or that Orion stage adapter. So their names are on that rocket.

It is fully built by NASA at Marshall Space Flight Center in Huntsville, Alabama. Now going back to the upper stage, that interim cryogenic propulsion stage, it holds roughly 24,000 gallons of liquid propellant. The liquid hydrogen tank is approximately 17,000 gallons, and the liquid oxygen is a roughly 6000 gallons. Much smaller in comparison to the core stage that holds roughly 733,000 gallons total. You have a 537,000 gallons of liquid hydrogen on the core stage tank, and then roughly 197,000 or 196, Fully fueled SLS weighs about 5.

74 million pounds of thrust. And now all these four tanks, the one on the upper stage and the one on the on the core stage, they feed all those things. They feed into the engines at liftoff. So the core stage will feed the four Rs 25 engines that you see at the bottom of your screen. There.

And the upper stage, meanwhile, will feed. It's one RL ten engine that is actually enclosed by the launch vehicle stage adapter. That is the nose cone shaped orange structure that you see on your screen there. It is actually a hiding the RL ten engine from our view, but this is done on purpose to protect the the upper stage. So to quickly recap, we are in fast fill for liquid hydrogen on our upper stage.

We have not started our propellant loading operations on the liquid oxygen tank yet. I'll report out once that operation is underway. And on the core stage. Meanwhile, we are still in our fast fill operations for both tanks, for both liquid hydrogen and liquid oxygen. This is Artemis as launch control.

We are currently eight hours and six minutes and counting from the opening of today's launch window for the Artemis two mission. Now, that launch window opens at 6:24 p. m. eastern time this evening. Teams do have a two hour launch window, which means that if we don't launch right at 624, they do have an additional two hours in which they can try to launch.

Now, the launch team, which we see here on our screen, they're currently in Firing Room one at NASA's Kennedy Space Center in Florida. They're in the process of loading liquid propellant onto the SLS rocket. Now, it's not just the launch team that's here in the firing room that is helping and is on on console for today's launch. But we also have supporting teams across the country that are tuning in to this countdown. One of those teams is actually the Artemis mission management team.

They recently just got here on console. They have a, separate section and room. If you actually look, it's to the right hand side of our launch director and assistant launch director, Charlie Blackwell Thompson and Jeremy Graber, respectively. Over there on the right hand side, where you kind of see that a glass enclosure structure in there is where our Artemis mission management team will sit for the duration of today's countdown. Now, they just recently arrived on console.

And apart from the mission management team, we also have the mission Control team at NASA's Johnson Space Center in Houston and the SLS Engineering and Support Center at NASA's Marshall Space Flight Center. And this doesn't include the other several contractor locations that are also around the country supporting this launch. And this mission. So again, you have our prime main launch team that is here in Firing Room one, Charlie Blackwell. Thompson.

You see there, she's wearing a green blazer. She's our launch director leading this team. But then there are also supporting teams that are also assisting the launch team throughout today's countdown. That includes the Artemis mission management team, the mission control team in Houston and the SLS Engineering and Support Center at NASA's Marshall Space Flight Center, in addition to several contractor locations that are located around the country. Now, as we mentioned, we are currently in our propellant loading operations for the SLS rocket.

Teams are currently in fast fill for both core stage liquid hydrogen and liquid oxygen. The core stage is the first stage of the SLS rocket. Here's a great graphic where you can see where we currently are at in our tanking operations, and you'll see above the core stage. We have also started our loading operations in the Interim Cryogenic Propulsion stage. This is the second stage of the SLS rocket.

Now we have not started loading liquid oxygen yet. I'll report out when that is underway, but in the meantime we are good with them. We are in the process of loading liquid oxygen and liquid hydrogen on the core stage, and liquid hydrogen on the upper stage. I'll report out when we are now starting our liquid oxygen operations on the upper stage. Welcome back.

This is Artemis at launch control. We're currently eight hours and one minute and counting from the opening of today's launch window for the Artemis two mission. I'm Anthony Jaramillo and NASA communications, and I, along with our fellow commentators, will be taking you through today's countdown. And actually joining me currently in the room here in Firing Room one is our assistant launch director, Jeremy Graver. Jeremy, thank you so much for taking the time to speak with us today.

No problem. Good morning. Tony. Happy to be here. You know, Jeremy, I think we recently heard the call out that our flight crew, our astronauts, they just got their wake up call.

Can you run us through kind of what the rest of the day now looks like for them? Absolutely. Yeah. They were woken up, just a little while ago. They'll get up, as most of us do on a on a busy, exciting day.

Get up. They'll get their breakfast. They'll they'll kind of get into the groove of the day. They'll go through, multiple meetings and discussions just to understand, where we are. In a little while, the launch director and our flight director will, provide a weather briefing for the flight crew to talk about all of the weather potentials that could, play into today's, launch opportunity.

Once that's complete, they will, then start getting suited up and they'll head to the suit room, start doing all their preparations from a, a suit up perspective as that's completed. They'll be checking with us to make sure that, we're ready for them to come to the pad, and then they'll be on their way. Headed out to the pad in the Astro van, ready to get out to Launch Pad 39. B, get up on top of the mobile launcher onto the two 74ft level. Go across the crew access arm into the white room and enter the Orion spacecraft.

So we're really excited for the for those events later today. It is. It's a very busy and exciting day like you mentioned. I hope they got some good rest and didn't, you know, wake up a bunch of times throughout the night? I know, I certainly did.

But just because of pure excitement like you mentioned. Now let's shift focus back on the rocket. How's propellant loading going? Everything is going very well right now. As I, stepped off console to come in here, the core stage two tank was about 95%, loaded.

The upper stage is probably about halfway and moving towards their, completion for H2. The liquid oxygen side of the core stage is in fast fill as well. And, proceeding well, and we will be getting into the upper stage low to loading in a little while. So all things moving, per schedule and, and working towards that, that plan for the day. That is great news.

And actually, I think we just heard that they got the, the go for transitioning into that liquid hydrogen, on the core stage two topping. So like you said, we're getting very close. Absolutely. That is exciting, you know. So can you tell us a little bit then about those upcoming milestones once we finish that propellant loading on all four tanks?

Yeah. So it's absolutely critical for us to get into what we call stable replenish on all stages. And what that means is the liquid oxygen and liquid hydrogen tanks on both the core stage and the interim cryo propulsion stage, or ICP, are fully loaded and we are just maintaining that level of of loading. And that's a very, quiescent configuration for us. And that's required for us to be in that configuration, to then be allowed to send the flight crew, our close out crew, which is there to assist the flight crew, getting on board.

Orion, we need to be in that stable replenish configuration to be able to send those crews out to the launchpad. And as we send those crews out, that is really, our press and our push to to launch. We'll get the crew on board. They go through a number of checks, communication checks, system checks, and then our close up crews job is to back out of the crew module, close all of our hatches, get us in configuration to be able to. Then the closeout crew to leave the pad.

And that puts us in, the configuration to allow us to proceed through the rest of launch countdown as we proceed down to, our final. Hold that. T-minus ten minutes. Where we do all of our launch polls, and determine that we are ready to pick up with what we call a terminal count, which is from t -ten minutes down to launch at t0. And, really excited to get to all of those milestones as we proceed through the day.

We are all very excited or or rooting for you guys watching along. And as you mentioned, you know, the reason to get to, all stages replenish first is because that's, that's the point where we're at the safest configuration to send people back to the launch pad. Correct? That is absolutely correct. It is, a very stable configuration.

It's the safe configuration that we require to ensure that, we're ready to send those crews out to the pad. Jeremy Kramer, thank you so much for taking the time to speak with us today, where we're rooting for you. Wishing you the best of luck, and we'll let you get back on console. Excellent. Thank you Tony.

Appreciate it. Go, Artemis. Go, Artemis. All right. And so just to quickly recap, we are now in our topping phase for liquid hydrogen on the core stage.

We are still in fast fill on the liquid oxygen side for the core stage, and also fast fill for the upper stage liquid hydrogen tank. I'll report back once we have entered our topping phase for liquid oxygen on the core stage. This is Artemis launch control. We are currently seven hours and 47 minutes and counting from the opening of today's launch window for NASA's Artemis two mission. That launch window opens at 6:24 p.

m. eastern time this evening. Now, the teams do have a two hour launch window. So that means if we can't launch right at 624, that's okay. They still have an additional two hours in which they can attempt to launch.

Now, currently, the Artemis launch team, what you see on your screen there they are in the process of loading cryogenic or super cold liquid propellant onto the SLS or the Space Launch System rocket. The teams actually just reported that we have completed loading liquid hydrogen onto the core stage of the rocket. Now, the core stage is the first stage of that SLS rocket. There's a great graphic representation of where we currently are in our tanking operations. So as you see, we are at 100% level for the liquid hydrogen tank on the core stage.

So that means we are now the teams are just going to be constantly replenishing that tank as some of that gap us as some of that liquid starts boiling off into a gas due to the temperatures as it starts warming up. So teams will therefore replenish it constantly to maintain this 100% flight level. Now, as you can see right above the hydrogen tanks, that's our liquid oxygen tank that's currently 70% of the way filled. And then on our upper stage or the interim cryogenic propulsion stage, this is the rocket stage that sits on top of the core stage. We are currently in our fast fill operations for liquid hydrogen on that upper stage.

Teams have not started liquid oxygen for the upper stage and that is totally normal. That is part of the countdown. We are scheduled to start our upper stage liquid oxygen loading operations until we start getting into, so we get much further into our, loading operations for the liquid oxygen tank on the core stage. So again, we are now in replenish for the core stage liquid hydrogen tank. And we are in fast fill for the liquid oxygen tank on the core stage and the liquid hydrogen tank on the upper stage.

On the upper stage. Now a quick recap on how the whole tanking loading process goes. Teams will first start with what is called chill down. So prior to us actually starting to load the super cold propellant onto the rocket, they will first chill down all of the systems and lines. This is done to make sure that it is able to receive these super cold temperatures.

In order for hydrogen to be in a liquid state, it needs to be -423°F. Oxygen in a liquid state is -297°F. So very, very cold temperatures. And as such, we want to make sure that we are conditioning all of the systems to be able to receive those cryogenic temperatures so that we aren't shocking the hardware and we're not causing any potential damage unnecessarily. Now, following chill down, we will transition into what is called course, into slow fill on the core stage.

Now, slow fill, as the name suggests, refers to slowly starting to feed that propellant onto the rocket. This officially marks the start of our propellant loading. Teams actually got into slow fill for the liquid oxygen and liquid hydrogen tanks on the core stage earlier this morning, a little bit before 9:00 am. Following slow fill is then when we transition into fast fill, this is where we stay for the majority of our tanking loading operations. Similarly to slow fill.

Fast fill refers to loading propellant at a much faster rate, and that is currently where the liquid oxygen tank state is in. We are in fast fill for liquid oxygen tank on the core stage. Now after fast fill we transition into topping. This is the last little bit that is needed to fill the tanks to 100% level. Hence why we're topping it off.

Following topping, we are now at 100%. And so now we transition into replenish mode. Replenish just means we're going to be constantly replenishing these tanks so that we make sure we are again at 100% flight level. Now you see on your, on your screen there, we can see some venting coming off the rocket. This is totally expected as we begin our loading operations, some of that liquid propellant starts warming up.

It'll start to boil off and vent outside of the rocket. Hence why we see some of that gas getting, getting expanded from down underneath where the engines are at the bottom, and also a little bit at the top where the upper stage is located. So again, an expected condition. Now let's take you through, the rocket a little bit. See, up there on your screen we have the Orion spacecraft.

Underneath there is the Orion stage adapter. The Orion stage adapter is what houses the, our secondary payloads or these, scientific cubesats. They're shoe boxes, scientific experiments that will go to space following separation from the upper stage. And the spacecraft. It's also the smallest section of the SLS rocket at only five feet.

Underneath, the Orion stage adapter sets the interim cryogenic propulsion stage, or that second stage. Underneath there is our core stage or the first stage of the rocket. Now the core stage. It consists of the propellant tanks, a ducts, the valves, avionics, and it also houses the four Rs 25 engines that are down there at the bottom, next to the core stage, we have our two solid rocket boosters. Each is taller than the Statue of Liberty.

Now, on those rocket boosters, you can see our NASA worm. The worm logo spans 25ft end to end, or roughly the length of one booster motor segment. And we actually have five segments each on each booster. So ten segments total. It's actually one segment more than what was used during the Space Shuttle program.

Now you should also be able to see some, some black and white markings, around the rocket. Now, these are used for imagery, for the SLS engineering and support team that's based out at NASA's Marshall Space Flight Center in Huntsville, Alabama. They use this for imagery to track and guide the rocket. After liftoff and during ascent. And it will also be used in their post-flight analysis.

Now, the orange color of the core stage is the thermal protection system. Or that spray on foam insulation. Now this provides the thermal protection for every part of the rocket. And when the foam is applied, it gives the rocket this light yellow color that the sun's ultraviolet rays eventually tan, giving our SLS rocket its famous butterscotch color. So again, to quickly recap, we are in replenish mode for the core stage liquid hydrogen tank.

We are about 75% of the way filled on our liquid oxygen tank. On the core stage. But we're still in fast fill. I'll let you know when we transition into topping for the core stage. Liquid oxygen tank.

And then on the upper stage, teams are also in fast fill for liquid hydrogen, and they have not started the liquid oxygen operations on the upper stage yet. I'll make sure to report out all of these milestones as they're underway. This is Artemis launch control. We are currently seven hours and 30 minutes and counting from the opening of today's launch window for the Artemis two mission. That launch window opens at 6:24 p.

m. Eastern Time. And teams do have a two hour launch window, which means that if we don't launch right at the beginning at 624, they do have an additional two hours in which they can attempt to launch. Our launch team is currently in Firing Room one at NASA's Kennedy Space Center in Florida, and are in the process of loading cryogenic or super cold liquid propellant onto the SLS or the Space Launch System rocket. Now, teams did just complete a fast fill for the liquid hydrogen tank on the upper stage, or our interim cryogenic propulsion stage.

Now, fast fill refers to loading propellant at a faster rate. This is preceded by chill down, which gets the system ready to receive these super cold temperatures. And then following fast fill. Teams will then transition into topping and replenish. I'll get more into those.

But before that again we just finish fast fill for the liquid hydrogen tank on the upper stage, and teams are now performing before they start topping what is called a vented relief test. This test is basically just pressurizing the upper stage tanks with helium to test the relief capabilities of the tank pressure to make sure that it can handle that pressure capability during flight. So between fast fill and topping, teams will perform this test on both the liquid hydrogen and the liquid oxygen tanks on the upper stage. Following that test completion, we will then transition into topping, which just means finishing loading the rest of the tank to 100%. Following topping wing topping, we enter what is called replenish mode.

Which basically just means that now we are going to be replenishing these tanks at a 100% level, because as we naturally get throughout the countdown, that propellant is going to start warming up and it'll start boiling and venting off. As you can see on your screen there what is happening. So because of that, and because the teams want to make sure that they still have 100% level in all four tanks, the two on the upper stage and the two on the, core stage, or the first stage of the rocket. They continuously replenish the tanks until the final ten minutes of the launch countdown, or what is known as terminal count. Now, speaking of replenish mode, we are currently in replenish mode for the core stage liquid hydrogen tank.

So you're just talking about how we finished fast fill on the upper stage liquid hydrogen tank. We are also then in replenish mode for the core stage liquid hydrogen tank. On the liquid oxygen side we are still in fast fill for the core stage, liquid oxygen. And then on the upper stage. We haven't started those liquid oxygen operations yet.

The teams want to wait until we are a little bit further along in the core stage liquid oxygen loading operations. Before we transition into that upper stage loading operation. Now, in total, the SLS and Orion rocket and Orion spacecraft are 322ft tall. At liftoff, SLS produces 8. 8 million pounds of thrust.

A little bit more than our the Saturn five rocket that was used during the Apollo missions, which were roughly 7. 5 million pounds of thrust to send those astronauts to the moon. With our SLS rocket, though, you don't just have those liquid oxygen, those liquid, fuel tanks that are fueling the rocket, but you also have two solid rocket boosters that are attached on either side. You see there on your screen right there. They also help provide that extra push and that thrust right at liftoff.

Now let's go up a little bit on the rocket. Go back to our upper or our second stage, our interim cryogenic propulsion stage. For those that have been following us along since Artemis one, you might remember that the Interim cryogenic Propulsion Stage for Artemis one provided the big push to send the Orion spacecraft on its way to the moon for Artemis two. However, it's going to be a little different. And the reason for that is because Artemis two is NASA's first crewed test flight, meaning we are sending astronauts on board this rocket for the first time.

And because of that, we are going to have the capability to practice a bunch of different systems and tests and operations that we couldn't do if it were uncrewed. One of these operations is what is called the Proximity operation demonstration. This involves the upper stage or that interim cryogenic propulsion stage and the Orion spacecraft practicing proximity maneuvers where they where the Orion spacecraft will practice approaching and getting away from the upper stage in a high Earth orbit. The reason teams want to practice this is in preparation for Artemis three and future Artemis missions for when Orion docks with our lunar landing systems. And so because of this, this means that the interim cryogenic propulsion stage will be separating from Orion much sooner.

Meaning that following this demonstration, it will be Orion's European service module that will actually send the spacecraft on its trajectory to the moon. It will perform what is called the trans lunar injection burn. Now, this proximity operation is scheduled to happen during the first day of flight. So pretty soon and NASA will be providing you with 24 over seven live coverage starting right now. As we have started, as we have been going through our propellant loading operations, and we will continue throughout the course of the entire mission, including all of the splashdown operations.

Artemis two will send NASA astronauts Reed Wiseman, Victor Glover and Christina Cook, and Canadian Space Agency astronaut Jeremy Hansen on a ten day mission around the moon and back. Orion is scheduled to splashdown off the coast of San Diego in the Pacific Ocean. So to quickly recap, teams are in the process of performing a vent and relief test on the liquid hydrogen tank on the upper stage following finishing their fast fill operations. Again, this test is to just test the the tanks that they can handle. The, the pressure that will be, happening during this first day of flight.

Following this test, it'll we will then transition into our topping phase on the upper stage liquid hydrogen tank. And it will then transition to replenish on the core stage. Meanwhile, we are still in fast fill for the liquid oxygen tank. And we are in replenish for liquid hydrogen. Now this is a very, very big and important milestone to me because again, for those that have been following us along, especially with Artemis two, during our fast fill operations on the core stage liquid hydrogen tank during wet dress rehearsal one, that was our, first test of this Artemis two moon rocket, where we tested loading the propellants on board.

Teams experienced the liquid hydrogen leak shortly after getting into fast build. During that first test. They then performed the second wet dress rehearsal, where they did not see any major leaks tanking. Loading operations went very smoothly and it was a very successful test. And so it's great to see that throughout today's countdown for launch, there also weren't any significant issues or leaks reported during our liquid hydrogen loading phase on the core stage.

So we are now in replenish mode for liquid hydrogen, or about 84% of the way on the liquid oxygen tank. And we're also almost there on the upper stage for liquid hydrogen. Now, I'll report out once liquid oxygen operations for the upper stage are also underway. Welcome back. This is Artemis launch control.

We are currently seven hours and nine minutes and counting from the opening of today's launch window for the Artemis two mission. Our Artemis launch team is currently in the process of loading liquid propellant onto the SLES, or Space Launch System rocket. Teams just reported out that we are in our topping phase for the upper stage liquid hydrogen tank. This means we are almost at 100%, if not pretty much there on that upper stage tank. The upper stage is the second stage of the SLS rocket.

Here's a graphic representation where we can see where we're currently at in our tanking operations. That means we have now finished loading our liquid hydrogen on both the core stage and the upper stage. As I said, we're in that topping phase to get us to 100%. And afterwards will then transition into replenish mode to stay at 100% level. You can see on the core stage, we are already at the replenish mode.

Have you see that 100% level right there? And we also just got confirmation that we are also in replenish for the upper stage liquid hydrogen tank. Now on the liquid oxygen side we still have a little bit to go. We're almost we're almost there on the liquid oxygen tank for the core stage. You see roughly 92% of the way filled.

And we haven't started our liquid oxygen, propellant loading operations on the upper stage. Teams are getting ready to start chilling down that tank. Teams do this to make sure that all of the systems and lines are ready to receive these cryogenic temperatures. As you can see on your screen, there, for hydrogen to stay in a liquid state, it must be -423°F. Oxygen, meanwhile, is -297°F.

So these super, super cold temperatures, we want to make sure that the rocket is able to receive them without damaging any of the hardware on board. So we'll start with chilling down that, liquid oxygen tank in mind before we actually start loading it onto the upper stage. I'll report back once that step is underway. As a reminder, our launch window opens at 6:24 p. m.

Eastern time this evening. Teams do have a two hour launch window, so that means if we don't launch right at 624, that is okay. They still have additional opportunities throughout that two hour launch window. Now, NASA is providing 24 over seven live coverage throughout this entire mission, beginning with our propellant loading operations. That is currently underway.

And as we continue our coverage this morning, we are also, and we continue monitoring all of our loading operations. We thank you for following us along. Part of our live coverage will, of course, include our launch this evening. That live launch coverage for Artemis two will continue right here at the beginning at approximately 12:50 p. m.

Eastern time. You can continue watching on our NASA's YouTube channel as well as on NASA. Plus. And the other NASA social media channels. Again, we are providing 24 over seven live coverage.

So following launch, the show doesn't end there. We have a ten day mission around the moon. And then following that, we're coming back home and we will be covering all of those splashdown operations as well. Artemis two is a test flight. It is NASA's first crewed Artemis mission we will be sending NASA astronauts, read Wiseman, who serves as the commander, Victor Glover, the pilot, and mission specialist.

Christina Cook. And then we're also sending Canadian Space Agency astronaut Jeremy Hansen, who serves as the other mission specialist for this mission. So to quickly recap, we are in replenish for both liquid hydrogen tanks on the core stage and the upper stage of our SLS, our Space Launch System rocket. And we are getting very close to being almost all the way full on the liquid oxygen tank in the core stage. I'll make sure to report out once we start entering, topping for the liquid oxygen tank in the core stage.

Again, that refers to the, the last little bit that is needed to get us to a 100%. And I'll also make sure to let folks know when our chill down operations are in work on the upper stage. Liquid oxygen tank. As a reminder, all of this propellant that is onboard these four tanks, of these two, two rocket stages, they feed the engines that are underneath and then provide the power and the push to send the Orion spacecraft on its voyage to the moon. This is Artemis launch control.

We are currently six hours and 49 minutes and counting from the opening of today's launch window for NASA's Artemis two mission. That launch window opens at 6:24 p. m. eastern time this evening, and we do have a two hour launch window, which means that if we don't launch right at the start at 6:24 p. m.

, that is okay. Teams still have an additional two hours in which they can try to launch the SLS or Space Launch System rocket, and the Orion spacecraft. Now, the Artemis launch team is currently in the process of loading cryogenic or super cold liquid propellant onto the SLS rocket. We are currently in what is called replenish mode for our liquid hydrogen tanks on board the SLS core stage and the Interim Cryogenic Propulsion Stage. These are the two stages on the SLS rocket.

Now, replenish mode means that we have finished loading hydrogen onboard both of these rock on board both of these rocket. That means they are at 100% level, and teams are just constantly replenishing the tanks to make sure that they stay at 100% since as throughout the countdown, that liquid propellant will start boiling off as it starts warming up, and it will then be vented out and released from the rocket. Which you can see there on your screen. Now, on the liquid oxygen side, teams are now in topping phase for the core stage liquid oxygen tank topping is the in-between state of fast fill and replenish mode. Fast fill is where we spend the most of the time.

Loading propellant. We load it at a much faster rate. Then once we reach a certain point, we will transition into topping to finish loading the tank to 100%. That is now where we are currently at in the core stage liquid oxygen tank and following topping. We then transition into replenish.

So we're in core stage liquid oxygen topping or in topping for the core stage liquid oxygen tank. And we are in replenish mode for both tanks on the liquid hydrogen, for liquid hydrogen on the core stage and the upper stage. Now meanwhile, on the liquid oxygen tank on the upper stage, teams just reported that they have now started to chill down for that upper stage tank. This is the first step that is needed before we actually start flowing and loading that propellant on board. The reason this is done is to chill down the systems in line so they are ready to receive those super cold temperatures and not cause any potential damage to the hardware.

For reference, oxygen needs to be -297°F to be in a liquid state, and hydrogen -423°F. So very, very cold temperatures that the rocket is dealing with right now. Now again, we are underway for the Artemis two mission. This is the second Artemis mission in the NASA's Artemis program. Artemis one was an uncrewed test flight.

Artemis two will be the first crewed test flight. This will be the first time we send astronauts on board our Orion spacecraft. We'll be sending our commander, Reed Wiseman, our pilot, Victor Glover, and mission specialists Christina Cook and Jeremy Hansen on a ten day mission around the moon. Now, from the rocket side, there aren't that many changes from Artemis one to Artemis two. Most of the major sections of vessels really remain unchanged.

Some of the differences are more in the in the details. To really just provide our astronauts with a better ride in space. Some of those include some optical targets that are now on the upper stage as visual cues during the proximity operation, demonstration. This will be a test for the astronauts to practice maneuvering Orion and practice approaching the upper stage while it's in a high Earth orbit. Another improvement for SLS was an improved navigation system, also communications capability between the ground stations and the U.

S space for space launch Delta 45, which controls the Eastern Range that is responsible for kind of helping dictate when we are allowed to launch here off the Space Coast in Florida. Now, all of the four tanks on the upper stage and the core stage, they feed the engines that are down below. At liftoff, the four Rs 25 engines will operate for the first eight minutes during flight, the two solid rocket boosters that are on either side, those operate for only two minutes, and they provide 75% of the power at liftoff. So to quickly recap, we are in replenish for our both liquid hydrogen tanks. We entered topping for the liquid oxygen tank on the core stage.

That means very, very soon we'll be in replenish mode for that tank as well. And we are in our chill down operations for the liquid oxygen tank on the upper stage. Pretty soon we will be entering fast fill. I'll report out when that is underway. This is Artemis launch control.

We are currently six hours and 38 minutes and counting from the opening of today's launch window for the Artemis two mission. That launch window opens at 6:24 p. m. eastern time this evening, and teams do have a two hour launch window in which they can attempt to launch the SLS or the Space Launch System rocket and Orion spacecraft. The Artemis launch team is currently loading cryogenic or super cold liquid propellant onto SLS.

We are currently in replenish mode for both liquid hydrogen tanks on the two stages of our SLS rocket. We're still in our topping phase on the core stage liquid oxygen tank. That means we're just finishing it up. You can see there it looks almost all the way full. And following that, it will enter into what is also into its replenish mode as well.

The liquid oxygen tank on the upper stage, meanwhile, is now in fast fill. So that means all four tanks are now receiving propellant. For. Following fast fill on the liquid oxygen tank for the upper stage, teams will perform that Benton relief test that they also did for the liquid hydrogen side on the upper stage. This test is again just to test the the relief capabilities to make sure that the upper stage can handle the, the pressure.

And that will be introduced at liftoff and during launch. Following that, it will then enter topping and will then go to replenish mode as well. Once we are in replenish mode for all tanks, that will be the signal to the launch team to tell our astronauts that they are ready to start heading out to the launch pad and get on board their Orion spacecraft. Now, Artemis two is a test flight, and it is NASA's first Artemis crewed mission. That means this will be the first time that our astronauts are Commander Reid Wiseman, pilot Victor Glover, and mission specialists Christina Cook and Jeremy Hansen.

They will be the first to experience launch and flight atop SLS. The rocket hits a maximum speed of 22,670mph. And our astronauts will get to experience the entire ride. So to quickly recap, we are in replenish mode for both liquid hydrogen tanks. We are in topping, meaning we are finishing up to, loading liquid oxygen on the core stage.

That is the first stage of the rocket, and we are in fast fill for the liquid oxygen tank on our second stage, or that interim cryogenic propulsion stage. I'll report out once we have also entered replenish mode for the core stage. Liquid oxygen tank. This is Artemis launch control. We are currently six hours and 22 minutes and counting from the opening of today's launch window for the Artemis two mission.

The launch team is currently in the process of loading cryogenic or super cold liquid propellant onto the SLES or the Space Launch System rocket. We're currently in replenish mode for both liquid hydrogen tanks on both the first stage and the second stage of the rocket. And then on the liquid oxygen side, we are in fast fill for the liquid oxygen tank on the upper stage. And then we are getting ready to get into our replenish mode for the liquid oxygen tank on the core stage. We are still in that topping phase, finishing loading the propellant tank to 100%, at which point then teams will transition into replenish mode as well.

Which just means that we are going to constantly be replenishing these tanks at 100% level. Now, today's launch window opens at 6:24 p. m.. Teams do have a two hour launch window, which means if we don't launch right on time, they do have an additional two hours in which they can attempt to launch. For those of you just joining us, NASA will be providing 24 over seven live coverage of this entire mission, starting with our propellant loading operations that are currently underway.

Thank you so much for everyone that's been following along. Our live launch coverage of Artemis two will continue right here, beginning at approximately 12:50 p. m.. Where the rest of my NASA commentators will be chiming in on how the rest of today's countdown goes and will take you through the rest of the mission. Now, Artemis two is a test flight.

It will be the first mission that sends astronauts on board SLS and Orion. You can see a photo on your screen there of our Artemis two crew. We have our commander, Reed Wiseman, on the right hand side. Then we have our two mission specialists in the middle, Christina Cook and then Canadian Space Agency astronaut Jeremy Hansen. All the way on the left is our pilot, Victor Glover.

All four of them woke up not too long ago, at around 9:25 a. m. this morning. Not a terrible wake up call. And that time they've been getting ready, having breakfast, getting some briefings.

And they'll get one more briefing. It's the flight crew weather brief. Well, they'll get a status on where we are in the countdown. What the current forecast looks like. Following that brief, they will then start their suit up operations before they go out to the launch pad.

And board their spacecraft. And teams that report that we have now entered replenish mode for the core stage liquid oxygen tank. So we are now in replenish for both liquid hydrogen tanks on the core stage and the upper stage. And we are also in replenish mode for the core stage. Liquid oxygen tank.

On the upper stage liquid oxygen tank meanwhile we are still in fast fill and I'll report out once. Then we transition from fast fill until the next up, which will again be that Benton relief test. This is pressurizing the upper stage tanks with helium to test the relief capabilities that the tank pressure, to make sure that it can handle that capability during flight. Following that test, teams will then start topping on the liquid oxygen tank and will then, after topping, will then transition into replenish mode as well. I'll report out when that's underway.

This is Artemis launch control. We are currently six hours and eight minutes and counting from the opening of today's launch window for the Artemis two mission. Now, the launch window opens at 6:24 p. m. eastern time this evening, and teams do have a two hour launch window, which means that they have two hours in which they can try to launch the flares or the Space Launch System rocket and Orion spacecraft that will send NASA astronauts Reed Wiseman, Victor Glover, Christina Cook and Canadian Space Agency astronaut Jeremy Hansen on a ten day mission around the moon and back.

Now, the launch team is currently in the process of loading cryogenic or super cold liquid propellant onto the SLS rocket. The propellants that are used to power SLS are liquid hydrogen and liquid oxygen. We are currently in our replenish phase for both liquid hydrogen tanks on the two phases of the rock. On the two stages of the rocket that is both the core stage and the Interim Cryogenic Propulsion stage. Replenish mode just basically means that now these tanks are at 100% level, and teams are going to constantly be replenishing them as they as they start to warm up and boil off, you can see some of that gas that's being vented off the rocket there.

That's normal. Teams totally expect to see that. And because of that, we have then a replenish valve to constantly be replenishing the tank with that liquid propellant. So we make sure that we are 100% level and we're not losing any propellants in the tank. The reason that you see some of that venting happening is because as we get throughout the countdown and the temperatures start to rise, that liquid propellant will become a gas.

And so it will start boiling off and then it will vent outside the rocket. Hence the need for a replenish valve. So we are in replenish for both liquid hydrogen tanks. We are also in replenish for the core stage liquid oxygen tank. And we are in fast fill for the upper stage or that interim cryogenic propulsion stage.

Liquid oxygen tank. Now fast bill is the main portion of our propellant loading operations, where teams are actively loading that propellant at a much faster rate. Now, following fast fill, teams transition into what is called topping. As the name suggests, it just means the top off the tanks. And then following topping we enter what is replenish.

So once we are at replenish for the liquid oxygen tank on the interim cryogenic propulsion stage, we're going to enter what is called all stages in replenish. This means that all four tanks on the SLS rocket are fully fueled, and our astronauts are ready then to go and head out to the launch pad when they get the go from our launch director, Charlie Blackwell Thompson. Now, coming up shortly, the, our astronauts will be, joining in on a flight crew weather brief with our launch director as well as with the flight director in Houston and the, the launch weather officer. They will provide a quick status on how the forecast looks for the rest of today's countdown, as well as where we currently are in our countdown operations. A little earlier, the launch weather officer did let our launch director know that we might get some showers in about two hours.

However, there is no lightning threat and they will plan on discussing this again during the flight. Crew weather brief. Currently, teams are forecasting 80% go for weather conditions during that two hour launch window. So again, to quickly recap, we are in replenish mode for both liquid hydrogen tanks. We are also in a replenish mode on the liquid oxygen tank on the core stage.

That is the first stage of the SLS rocket. And we're in fast fill for the liquid oxygen tank on the upper stage. I'll report out when we have transitioned from fast fill and on to topping. This is Artemis launch control. We are currently five hours and 42 minutes and counting from the opening of today's launch window for the Artemis two mission.

That launch window officially opens at 6:24 p. m. Eastern Time, and teams do have a two hour launch window, which means that they have additional opportunities if they don't meet the beginning of that window. Now, joining me is Artemis launch director, Charlie Blackwell Thompson. Charlie, thank you so much for taking the time to speak with us today.

Oh, you're more than welcome. It's great to be here, Tony. It sure is. Now, we know that, you just conducted a flight crew weather brief with our astronauts, as well as teams and, mission control and our launch weather officer. Do you mind providing us kind of how that went and, and what we can expect?

Yes. The weather brief went really well. What we do during that weather brief is we give the flight crew a summary of where we are in our tanking, what's left? And of course, we have our core stage and our upper stage fully loaded with two, and we're in replenish. And we are just finishing up our, low to or liquid oxygen load into the upper stage.

We provided that status, along with any, non-conformists that the crew might be interested in. And, and then we went through the weather. And so our weather from our launch weather officer, remains at a, 80%, likelihood of go today and a 20% chance of violation, we are watching some precip that is making its way toward the pad, but, we expect that that is going to dissipate as we get closer to the opening of our window. So, really good, to hear the crew's voices and to talk through, day of launch ops. You know, it's something that we simulate, but there's nothing like the real day.

Absolutely. I can only imagine. And it's great news to hear that we are still 80% go. Those are very, very favorable conditions. Let's hope it stays that way.

You mentioned we're getting closer to reaching what is called all stages in, stable replenish. That means that we will have all four tanks at 100% flight level. Charlie, can you walk us through then what are some of those upcoming milestones once we reach all stages, replenish? Absolutely. So one of the big milestones when you reach stable, replenish on all the, all stages is, you begin to send the closeout crew into the pad.

And so we're just a few minutes away from, getting into that, and the will deploy them to the pad and they'll start getting ready for the flight crew. And then, of course, shortly after that is the exciting milestone of seeing the crew walk out of the operations and checkout building and make their way to the pad. And that's certainly something that, we've been waiting a very long time to see. It's going to be very exciting, I think, for certainly for our team, it'll be exciting for our country and it'll be exciting for people all over the world who are watching, our crew head to the pad knowing that we are just about five hours or so from from launch. It.

You couldn't have said it any better. This is very exciting for the entire world. We cannot wait for that moment when we see the, our astronauts depart the crew quarters and head to the pad. Charlie, thank you so much for taking the chance to, to speak with us today. We are rooting for you.

We're wishing you the best of luck in today's countdown, and we'll let you get back on console all right. Thank you. Tony, appreciate the opportunity to chat with you. And, Go, Artemis. Go.

Artemus. All right, so to quickly recap, we are in replenish mode for both liquid hydrogen tanks. And we are getting ready to also hit replenish mode on the liquid oxygen tanks for both of those, we'll we will report out when that is underway. This is Artemis launch control. We are currently five hours and 37 minutes and counting from the opening of today's launch window for NASA's Artemis two mission.

Now, the launch team is currently in the process of loading cryogenic or liquid propellant onto the SLS rocket. You see, our launch team, they're in Firing room one, and you actually can see our NASA administrator, Jared Isaacman. He just joined the room to greet our launch director, Charlie Blackwell Thompson, and our assistant launch director, Jeremy Graver. Now to quickly recap, we started our propellant loading operations at 8:35 a. m.

Eastern time. That was after we had, chilled down the, the core stage systems lines. And after we had been given the go from our launch director to start our tanking operations. So after 835, we started again, slow fill a little bit. After that, at 925, our astronauts got their scheduled wake up call.

Following slow fill on the core stage. We then transitioned into fast fill. Once we were in fast fill for the core stage, we then started our upper stage loading operations. We started first with hydrogen. Started chilling down the liquid hydrogen tank on the upper stage at roughly 9:36 a.

m. , and then we got into fast fill at 9:51 a. m.. Following that, we entered. Then our topping phase on the core stage liquid hydrogen tank topping refers to finishing up that last little bit to get to 100%, and then we transitioned into replenish.

We did the same thing for the core stage liquid oxygen tank, as well as for the liquid hydrogen tank on the upper stage. Now all that's left is to enter replenish mode for the liquid oxygen tank on our upper stage, and we will enter what is called all stages. Replenish. This means that now all four tanks will be at 100% level. Once we reach this stage, this will be the signal for our launch team to let our astronauts know that they have the clear to enter the launch pad and go and enter their spacecraft.

As a reminder, NASA is providing 24 over seven live coverage of this mission. We started this morning at 7:45 a. m. and ran you through our tanking loading operations, and we will continue to do so throughout the rest of today's launch countdown. We will be beginning our live coverage in just a few minutes for that launch, and the rest of our commentators will make sure to take you along through today's countdown.

You can see on your screen there how to watch. And as our launch director just recently said, when she came on air, let's go. Artemis two.

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