SpaceX says the next major flight milestones for Human Landing System are a long-duration flight test and an in-space propellant transfer flight test, both targeted for 2026; timing will depend on progress with upcoming Starship V3 flight tests. NASA’s HLS program materials also say SpaceX is expected to demonstrate cryogenic propellant transfer in Earth orbit and an uncrewed lunar landing before crewed Artemis missions.
Technically, this is the critical bridge from prototype launch vehicles to a real lunar transport system: long-duration on-orbit survival proves thermal control, power, avionics, and life-support endurance, while propellant transfer is the enabling technology for sending a heavy lander to the Moon. For the Lunar Ark, these capabilities directly affect cargo cadence, emergency return options, and the feasibility of maintaining depots, landers, and surface logistics over decades.
Ark action: monitor Starship V3 flight test outcomes, propellant-transfer test design, and NASA HLS schedule changes; integrate lessons on cryogenic fluid management, docking interoperability, and long-duration dormant storage into Ark architecture; and track whether 2026 slips alter the sequence for uncrewed lunar landing demonstrations and Artemis III-adjacent milestones.