REGISTER NOW Chojnacki said NASA has taken very different approaches to the HLS versus SLS program, even beyond the contracting model. “SLS was a very traditional NASA program. NASA laid out a very strict set of requirements and dictated propellant inventory, dictated all the things to the various elements. They flowed down. They were cost-plus programs where the aerospace companies would respond, and we would work in a very traditional manner,” he said. “Moving to HLS, we’re doing a lot of moving parts at one time. On SpaceX’s contract right now, for their initial landing, there are 27 system requirements. Twenty-seven, and we kept it as loose as possible.” Under SpaceX’s contract, they must meet mandatory design reviews, but SpaceX can also propose additional milestones for payment. One requirement that SpaceX requested is the ship-to-ship propellant transfer demonstration. Those tests are set to begin around March 2025, with testing concluding in the summer, Chojnacki said. “That would be the first time that’s demonstrated on this scale, so that is a big building block. And once you’ve done that, you’ve really cracked open the opportunity to move massive amounts of payload and cargo outside of the Earth’s sphere. If you can have a Starship with propellant aggregation, that’s going to be the next step to doing an uncrewed demonstration.” In addition to the testing, the next major review of Starship will be the Critical Design Review (CDR) in Summer 2025, which is when NASA certifies that the company met all 27 of those system requirements. Chojnacki said NASA astronauts also meet with SpaceX once a month to provide input on Starship’s interior. The company is building mockups of the crew cabin, including the sleeping quarters and laboratory, at Boca Chica. NASA anticipates getting a design update this month before looking at it during the CDR next year. That isn’t the only place where NASA has offered its input: It also offered input on some aspects of the rocket design, like the vehicle’s cryogenic components, as well as conducting some testing on the thermal tiles that help keep the cryogenic fuels cold. If all goes to plan, SpaceX will land astronauts on the moon in September 2026. “That is definitively the date we’re working towards. We don’t have any known road blocks. We do have some first-time things that have to be demonstrated, and we have a plan in place to go demonstrate those. Topics