Will SpaceX complete an in-orbit Starship propellant-transfer demonstration in 2026?
resolves Dec 31, 2026
Resolution criteria: SpaceX conducts a successful ship-to-ship (or ship-to-depot) transfer of propellant between two Starship vehicles in orbit during calendar 2026. A failed attempt, an intra-vehicle test, or no attempt by Dec 31, 2026 does not count.
Refueling a spaceship in orbit is the linchpin of humanity's return to the Moon — and SpaceX has it on the manifest for this year. But between here and a successful ship-to-ship propellant transfer lies a gauntlet of firsts no rocket has ever strung together, and the clock runs out December 31. So does SpaceX pull off the orbital-refueling demo in 2026, or does it slip to next year? We mapped the full ladder of prerequisites still unmet, the realistic flight cadence left in the year, every official target and how it has moved, the program's track record against its own timelines, and where the forecasters sit — then committed to one calibrated probability. The number on the milestone the entire Artemis Moon program is waiting on. Built from 176 sources.
solid176 sources
$19
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