SpaceX reported that its Starship test campaign demonstrated a Raptor lunar-landing throttle profile capable of supporting a Starship landing on the lunar surface. The same campaign included Starship’s ninth flight test on May 27, 2025, a successful full-duration ascent by a reflown Super Heavy using all 33 Raptor engines, approximately 5 metric tons of in-space cryogenic propellant transfer, successful Raptor relights, and controlled atmospheric reentries.[1]
The result is a relevant propulsion demonstration, not proof of an operational lunar lander. Throttle authority during terminal descent must be combined with reliable engine relight, precision navigation, plume–surface interaction control, landing-zone tolerance, cryogenic propellant management, and repeatable flight operations. For the Ark, these capabilities determine whether lunar sites can receive heavy construction systems, redundant power, shielding, laboratories, and seed archives without depending on a single high-risk landing.[1]
The Ark team should track whether SpaceX publishes measured throttle ranges, minimum stable thrust, landing-burn duration, engine-out margins, guidance accuracy, and results from vacuum or lunar-regolith tests. Incorporate these parameters into transport simulations and require mission architectures with multiple landed vehicles, distributed archive sites, and pre-positioned recovery capacity before committing critical archives to a Starship-based lunar logistics chain.