[00:02] flight fidelity Starship HLS cabin at Starbase. >> This is it. SpaceX just lifted the curtain on the crew cabin of the Starship human landing system. The spacecraft that will return humans to
[00:14] the lunar surface for the first time in over 50 years. Not only interior details, but also development progress. That's exactly what we're digging into today. Let's dive in. At a recent NASA Artemis 3 briefing, Jessica Jensen, the
[00:29] woman who runs SpaceX's entire customer operations, said something quietly extraordinary. >> The primary structure is assembled and prepared to be outfitted with key functional systems like avionics, power,
[00:42] in the next few months. >> Exciting, right? After a long stretch of silence, no updates, no timelines, nothing, SpaceX finally stepped in front of a room full of senior NASA officials and said this out loud. And what makes
[00:57] it hit differently this time is that she's not talking about another concept, not another polished 3D render. She's talking about a real Starship HLS cabin built from real materials. And soon it will be equipped with real life support
[01:12] systems designed to carry real human beings to the moon for the first time since Apollo 17 left the lunar surface in 1972. And the best part is we don't have to wait months as Jessica suggested. Based on everything SpaceX,
[01:27] NASA, and multiple contractors have already revealed, we can begin exploring the inside of this spacecraft right now and discover why Starship HLS may be the most revolutionary lunar lander humanity has ever built. But before we can step
[01:42] inside, we need to understand why the journey to that cabin is more complex than any trip in human history. Because Starship HLS is nothing like a plane or a car, you can't simply climb into the cabin and take off. To fly to the moon,
[01:56] it needs such an enormous amount of propellant that it's impossible to carry enough from the ground. The solution? Refuel in orbit. But orbital refueling isn't as simple as pulling into a gas station. It's an extraordinarily complex
[02:10] process spanning weeks and absolutely not safe to carry out with people sitting inside throughout. Only once the Starship Depot has been fully fueled Starship Depot has been fully fueled does Starship HLS launch. It flies up,
[02:23] tanks with that super chilled propellant, and then waits in low Earth orbit. And then Orion arrives carrying two NASA astronauts launched aboard the SLS from Earth. The two spacecraft rendevu and dock in LEO, one small, one
[02:40] enormous. Like a tiny boat lost in the middle of the ocean, suddenly spotting an aircraft carrier materializing through the fog. A 15-story building floating in space, white as a blank sheet of paper. That is Starship HLS.
[02:56] Standing roughly 50 m tall, 9 m in diameter. Its stainless steel hole coated in white thermal reflective paint to protect the cryogenic propellant inside from solar radiation. Five large solar arrays spread open like enormous
[03:11] flower petals, each nearly 18 m long, slowly rotating to capture maximum sunlight. Many people wonder whether deploying solar panels that large would slow the spacecraft down or push it off course. In reality, no. On Earth, if you
[03:25] open an umbrella into the wind, the drag can tear it apart. But in the vacuum of space, there's no air to create drag. So deploying the solar arrays has virtually no meaningful effect on the spacecraft's trajectory or velocity. Only after the
[03:39] solar panels have been deployed and are supplying stable power does Starship HLS begin its long journey to the moon. Orion maneuvers carefully. The two spacecraft approach nose tonose. The docking mechanism designed to the modern
[03:54] androgynous standard inherited from the Dragon 2 system but optimized for the lunar environment locks into place with a single metallic clunk that both astronauts will hear clearly through the hole. NASA has comprehensively tested
[04:07] this docking assembly at the Johnson Space Center across more than 200 different approach scenarios. Nothing is left to chance. The connecting tunnel opens and the astronaut steps through. This moment, this is the moment everyone
[04:21] needs to pay attention to. Stepping from Orion into Starship HLS is like stepping out of a compact car into a sprawling luxury mansion. Orion's pressurized luxury mansion. Orion's pressurized cabin is under 9 cub m. Starship HLS
[04:35] offers an estimated 160 m of livable pressurized space. Nearly 20 times more. That's not a typo. 20 times. The first thing you feel isn't technology. The
[04:47] first thing you feel is space. After days crammed inside Orion, sitting shouldertosh shoulder, every piece of gear stowed tight, every movement calculated. Stepping into hls is stepping into something that feels
[05:02] almost like freedom. High ceilings, cool, clean, steady air, warm artificial light washing evenly across the walls from LED strips running all the way around. They'll spend those first days just settling in, getting to know their
[05:18] temporary home. One side of the cabin opens into a spacious common area with a foldway dining table and seating that's genuinely comfortable compared to anything Orion offered. And the food, no more cold energy bars or pouches of
[05:32] reconstituted powder. They can actually heat up real meals. rice, meat, vegetables, even some fresh items kept in refrigerated storage. Using a compact but surprisingly capable galley system in microgravity or under the moon's weak
[05:48] pull, eating becomes a much more pleasant experience. No more worrying about crumbs floating into your eyes. And above the dining area, set into the curved wall, is what SpaceX calls the bridge. It looks nothing like a
[06:01] traditional spacecraft cockpit. No rows of physical switches, no analog dials, of physical switches, no analog dials, no mechanical controls. Instead, large highresolution touchcreens. And not just here. They're in the common area outside
[06:15] each sleep cabin, flanking both airlocks everywhere. The lead starship software developer described it directly. The UI has to work for crew members doing completely different jobs. A commander reviewing descent trajectories. A flight
[06:29] surgeon checking life support telemetry. A geologist pulling up landing site A geologist pulling up landing site maps. Same interface, same ship, just looking. It's a completely different philosophy from Dragon, which had three
[06:43] fixed screens in a compact capsule built for one single job. Starship HLS is different in kind, not just in scale. Further back are the private sleep quarters. No more hanging a sleeping bag against the wall like an Orion. Starship
[06:58] HLS has individual crew cabins, compact but genuinely private with fixed sleeping surfaces, dedicated sleep restraints, and just enough personal space for each astronaut to decompress after a long shift. Sleeping a full deep
[07:13] sleep on the moon that's going to feel completely different from those restless nights in a cramped capsule. And to stay in shape, they train every day. The exercise area is cleverly designed around space efficient multi-purpose
[07:25] equipment. A treadmill built for lowgravity environments, a rowing machine, resistance bands, all working to fight the muscle and bone loss that's plagued astronauts on long duration missions. When they're done, they can
[07:38] clean up with a hygiene system that's a genuine step up from anything Apollo era. Recycled water, real privacy. Through all of this, the ECLSS, the environmental control and life support system, runs quietly in the
[07:52] background. And we're not talking about the barebones setup from the old Apollo lunar module, where astronauts had a few lithium hydroxide canisters to scrub CO2 and a pair of silver zinc batteries to power the entire spacecraft for a grand
[08:07] total of 2 or 3 days. This is a full closed loop system. CO2 scrubbing, automatic pressure regulation, humidity control, continuous atmospheric sensors
[08:19] monitoring every breath they take. SpaceX actually tested this with four people inside a full-scale cabin mockup in Hawthorne, California, running continuously for a full 7 days, eating, sleeping, exercising, the whole thing. 7
[08:34] days. That's also exactly how long Artemis 4 plans to stay on the moon. But before any of that begins, the ship still has to land. At around 100 m above the surface, HLS would have already fired up its secondary thrusters. Small
[08:50] gaseous propellant jets mounted high on the hull rather than at the base. The six main Raptor engines, so powerful that even at their lowest throttle setting, they'd blast the lunar regalith into a storm of razor sharp particles,
[09:03] are shut down. The smaller auxiliary thrusters take over, easing the spacecraft down as gently as a helicopter. The four landing legs had already deployed. Ranging sensors feed continuous data to the flight computer.
[09:16] The crew watches, they verify, but the ship lands itself and SpaceX is betting everything on its software. And then touchdown, a gentle contact. So gentle
[09:28] that the astronauts inside might not feel it at first, but the computer knows, the sensors know, and after a few seconds, the display lights up. Touchdown confirmed. Before anyone sets foot on the surface, there's one more
[09:41] thing to do. Check systems, run through procedures, and suit up. And this is where you start to understand why HLS's two airlocks are a stroke of engineering genius. The old Apollo lunar module had no airlock at all. To go outside, the
[09:57] crew had to depressurize the entire cabin down to zero, suit up inside, climb out through a hatch on top of the cockpit, crawl out, and then descend a ladder. All while wearing a bulky pressurized space suit. Every single EVA
[10:12] was a technical circus act. And every time they came back, they dragged in a cloud of lunar regalith dust, stuff as sharp as shattered glass, straight into their living space. Starship HLS has two separate airlocks, each around 13 cubic
[10:27] out simultaneously without depressurizing the main cabin at all. Inside each airlock, there's enough room to fully dawn and doth the Aximu suit. Axiom Space's next generation EVA suit developed specifically for Artemis.
[10:43] along with a dedicated PLSS rack for the backpack life support unit. Hand holds positioned precisely based on ergonomics research and data ports that tie directly into the ship's comm systems. Two NASA astronauts have actually tested
[10:57] this airlock mockup at Hawthorne in person, fully suited, running through every motion, every maneuver, every handhold. Not for a pretty slide in a status report, but because their lives depend on every single detail. And below
[11:11] the airlock, something you've never seen on any landing vehicle in history, an elevator. The distance from the HLS cabin down to the lunar surface is about 35 m. The equivalent of climbing from the ground floor to the 12th floor of a
[11:25] building. in a heavy rigid EVA suit with a PLSS strapped to your back. Climbing a folding ladder bolted to the outside of the hole is not a great idea, especially time in your life and your entire nervous system is trying to make sense
[11:41] of gravity that's only 16th of what you've known your whole life. So SpaceX designed an elevator. Nothing fancy, more like an industrial cage lift or what people often describe as a shark cage, but solid, reliable, and built to
[11:56] do exactly one thing. Get astronauts and equipment down to the surface safely. The airlock door opens. The astronaut steps into the cage. The mechanism begins its slow descent. This is a moment that no computer simulation can
[12:09] fully capture. As the elevator descends, the lunar surface rises to meet you. The ash gray of the regalith scattered small craters. The enormous shadow of Starship HLS stretching out ahead. And in the distance, the horizon curves because the
[12:25] moon is smaller than Earth against a sky of absolute black. No atmosphere, no scattered light. Just the sun blazing like a white diamond hanging in the >> Later this year, we are targeting our inspace shipto- ship propellant transfer
[12:40] demonstration. This is a core technology that will enable Starship to land humans moon. >> Orbital refueling has been flagged for years as the single biggest reason Artemis kept slipping. But now SpaceX
[12:55] just found a smarter way to do it. A new approach that cuts refueling flights down dramatically and keeps every future lunar mission on track. It's been nearly 60 years since we last set foot on the moon, and we're finally about to do it
[13:08] again. this time with Starship HLS, SpaceX's massive lunar lander. But there's one critical barrier standing in the way. You can't just fill it up on the launch pad and go. Earth's gravity is brutal. By the time Starship clears
[13:23] the atmosphere and reaches orbit, its tanks are essentially empty. Every drop of propellant burned, fighting gravity is propellant that can't be used for the actual mission. And to land on the moon and come back, Starship HLS needs
[13:38] roughly 1,200 tons of liquid methane and liquid oxygen, fully loaded in orbit. There's no way around this. Orbital refueling isn't a plan B. It's the only plan. Now, here's where it gets serious. Every refueling flight is a full
[13:53] Starship launch. Full preparation, full complexity, full risk. And in space flight, risk doesn't add, it multiplies. If each flight has a 95% success rate,
[14:05] that sounds pretty good. But string five flights together and your overall odds drop to 77%. 10 flights, you're barely above 60%. The more tankers you need, the more chances something goes catastrophically wrong
[14:19] before the HLS ever leaves Earth orbit. And at that point, there's no crew on the moon. Just a very expensive failure. So, why does Starship need so many refueling flights in the first place?
[14:32] There are several reasons, and each one makes the problem worse. The first comes down to a formula every rocket engineer knows by heart, the Schulovsky rocket equation. It says something simple but brutal. The amount of propellant you
[14:46] need grows exponentially as delta V increases. It doesn't just double when you want to go twice as fast, it explodes. In practice, that means to deliver one extra ton of propellant to orbit, you need more than one ton of
[14:59] propellant in the lower stages just to push it up there. And to push that extra propellant, you need even more. It becomes a vicious multiplying loop. In the old Aremis architecture, Starship HLS had to fly to NRH,
[15:14] a very distant orbit around the moon chosen because Orion's limited delta V could only reach it. But traveling from NRH down to the lunar surface and back NRH down to the lunar surface and back up cost the HLS an extra approximately
[15:28] 1,50 m/s of delta V compared to starting that number through the rocket equation for a ship weighing hundreds of tons, it adds roughly 400 to 450 tons of extra
[15:42] propellant that needs to be refueled in LEO. That's the equivalent of two to three full tanker flights just to make up for the NRH penalty with zero actual benefit to the mission. The second reason, propellant boils off even when
[15:56] no one is burning it. Liquid methane and liquid oxygen are stored at cryogenic liquid oxygen are stored at cryogenic temperatures between - 160° C and - 183°. In space, no matter how well you
[16:10] insulate, heat still sneaks in from sunlight. Earth's infrared radiation and the ship's own electronics. When heat gets in, the propellant turns into gas slowly, constantly, nonstop. This is what the industry calls boil off. In the
[16:26] old plan, the depot had to hold the propellant in orbit for weeks while the tankers launched one by one and filled it up before the HLS even launched to pick it up. Every day of waiting meant losing propellant that could never be
[16:39] recovered. Boiloff is estimated at 0.1% to 0.3% per day without active cooling. With 1,000 tons of propellant, waiting just 30 days could cost you 30 to 90 tons gone. To make up for that lost propellant, you need even more tanker
[16:55] flights. And each extra flight adds more waiting time, which creates even more boil off. A vicious cycle. The third reason, transferring cryogenic propellant in space is much harder than it sounds. On the ground, gravity does
[17:09] all the work. Fuel flows downward naturally. In orbit, there's no gravity. don't sit at the bottom of the tank. They float around forming huge chaotic
[17:21] blobs and bubbles. If you just open the valves and try to pump, you'll push gas bubbles into the lines instead of liquid, causing cavitation, damaging pumps, or even losing pressure control. SpaceX's solution is called burn. firing
[17:37] small RCS thrusters to create a tiny bit of acceleration that pushes the liquid to the bottom of the tank before pumping begins. In theory, this technique is known, but it has never been done with hundreds of tons of cryogenic propellant
[17:51] hundreds of tons of cryogenic propellant between two spacecraft flying at 7.8 km/s in vacuum. This is exactly why the ship-to- ship propellant transfer ship-to- ship propellant transfer demonstration planned for late 2026 is
[18:03] the most critical milestone in the entire program, even more important than regular flight tests. If it doesn't work, there is no Artemis 4. So, how do launches while still delivering enough propellant for Starship HLS? It's
[18:19] actually pretty straightforward. First, redesign the tanker to carry more. tanker still needs to keep some propellant reserved for landing back on Earth. That's efficient for regular operations, but not ideal for a
[18:33] highstakes human mission. So, SpaceX is planning to fly these tankers in expendable mode. The V3 tanker variant will strip out the heat shield, flaps, and anything else not needed, making it significantly lighter. Lighter means
[18:48] less propellant burn to reach orbit, so more can be transferred to the depot. Musk expects each V3 tanker to deliver around 200 tons of usable propellant. In theory, that brings the total down to about six flights for the 1,200 tons
[19:03] needed. Reality won't be that clean, but it's a big step in the right direction. Second, solving the depot's boiloff problem. SpaceX is developing a zero boiloff system. Basically, electric cryocoolers powered by solar panels that
[19:17] keep the internal temperature below the propellant's boiling point. They're also adding sunshields to block as much solar heat as possible before the coolers even have to work. Another simpler but effective approach, increase launch
[19:29] cadence. Fire the tankers up in rapid succession so the depot doesn't have to wait around for weeks or months. If you can launch 10 tankers in two weeks instead of 2 months. Total boiloff drops dramatically. This is exactly why SpaceX
[19:43] is building multiple launch pads at both Starbase in Texas and LC39A in Florida to achieve a launch rate never seen before in rocket history. And finally, here's the big move that NASA hinted at in the press conference. Cut out four to
[19:59] five tankers with one single decision. Remember that 1,50 m/s NRH penalty we talked about? that extra 400 to 450 tons of propellant just because Orion is too
[20:11] weak to reach low lunar orbit. The question the analyst community and eventually NASA asked was instead of building the whole architecture around Orion's weakness and making Starship carry all the burden, why not let
[20:24] Starship solve the problem? The new flow in the service of our >> the depot and tankers operate as before, launching and filling the depot. The HLS launches, docks with the depot, and fills up. But instead of heading off
[20:38] fills up. But instead of heading off alone to NRH and waiting 30 to 90 days, the HLS stays in LEO and waits for Orion. SLS launches Orion with the crew Orion. SLS launches Orion with the crew into LEO. Just LEO. No expensive upper
[20:52] stage or TLI burn needed. Orion docks with the HLS right there in low Earth orbit. Then comes the key moment. The Starship HLS fires its Raptor vacuum engines and performs the entire TLI burn, pushing the whole stack Starship
[21:09] plus Orion straight to low lunar orbit, not NRH. From Lll, the crew transfers into Starship, which descends to the moon, does its job, ascends back to Lll and redox with Orion. Orion then separates
[21:24] and returns to Earth using its service module, what it's actually good at. The impact on propellant needs is immediate. Eliminating the NRH penalty removes that Eliminating the NRH penalty removes that 400 to 450 tons. The HLS no longer has
[21:39] to loiter for weeks or months in deep space. So boil off during that period disappears, too. Altogether, the number of tankers drops from 11 to 13 down to roughly 6 to 7. It's still not perfect. There's still a lot. But saving four to
[21:54] five tankers per mission can increase overall success probability by as much as 50%. Those are the most practical approaches we have right now. Do you think they'll work or do you have a better idea? Drop it in the comments
[22:07] below. Who knows, maybe a SpaceX engineer is watching and your idea might just make it into the next design. There's also a benefit many people overlook. With this new architecture, Orion only needs to reach LEO, which
[22:21] makes the mission launch window much more flexible. In the old plan, even a few days delay with Orion could force a full reset of the intercept with HLS, on full reset of the intercept with HLS, on its way to NRH. In the new plan, if
[22:34] handle it near Earth and abort home in hours instead of days. And if Orion only needs to reach LEO, does SLS at2 to4 billion per launch still make sense? In theory, Falcon Heavy, Volta, or even New
[22:50] Glenn could do the job at a fraction of the cost. Short-term answer, yes, it's still needed because of existing contracts, and because Orion isn't certified to fly on anything else yet, but long-term, this new architecture is
[23:04] quietly rewriting the role of every piece in the Artemis program. But before we close out, let's talk about the actual hardware because NASA's live stream also dropped some details about the specific Starship that'll fly on
[23:17] Artemis 3 and it's not what most people expected for Artemis 3. SpaceX won't be using the fullup Starship HLS lunar lander, the one with the fancy pressurized crew cabin, life support systems, and elevator. Instead, they're
[23:33] going with a standard Starship V3 off the line. basically a regular production vehicle with just one major modification, a docking adapter, so Orion can connect to it. This Starship won't have a full lunar landing system,
[23:47] no pressurized crew cabin for astronauts to live in, and no elevator. The crew will dock with it in low Earth orbit, but they won't transfer inside. The main goals are to test rendevous, proximity operations, docking, and how the two
[24:01] vehicles operate together as a single stack. It's basically a Pathfinder/docking demo mission. In the community, the ship most people are pointing to for this role is ship 44. It was pulled from the
[24:14] normal production line around mid2025 and features the distinctive HLS style nose cone. While other V3 ships continued flying, ship 44 has been held back in Star Factory, making it the strongest candidate for this Artemis 3
[24:30] test flight. And honestly, this approach makes perfect sense. The full HLS is an incredibly complex vehicle with advanced life support, landing systems, and crew accommodations. Using something that's sophisticated for a single test flight,
[24:45] especially one that might not return to Earth, would be overkill and expensive.