Two Starship vehicles met in orbit this week and did something no pair of spacecraft had done before at this scale: one passed roughly 100 metric tons of supercooled liquid methane and liquid oxygen to the other, a choreographed handoff conducted at a closing speed of less than a tenth of a meter per second. The transfer, completed over about 45 minutes, is the technical foundation of SpaceX’s plan to refuel ships in space for trips to the Moon and Mars.
The demonstration is a key milestone for the Starship program and for NASA’s Artemis lunar campaign, which depends on orbital refueling to land astronauts on the Moon. TechCrunch noted the test also strengthens the case for a future SpaceX initial public offering, with analysts pointing to the company’s progress on reusability and deep-space infrastructure as valuation fuel.
The test
The operation unfolded in stages. A tanker variant of Starship, launched with minimal payload and maximum propellant, rendezvoused with a depot vehicle in low Earth orbit. The two ships docked using a mechanism derived from the one SpaceX developed for Crew Dragon’s berthings at the International Space Station, capturing the port with sub-centimeter precision. With the ships mated, pressure differentials moved about 100 metric tons of propellant between the tanks, after which the tanker undocked, performed a deorbit burn and splashed down in the Pacific. The entire sequence played out roughly 250 kilometers above the Earth, in an orbit chosen to keep the tanker’s return leg short.
The test builds on years of incremental work. NASA awarded SpaceX a Tipping Point contract in 2020 to demonstrate cryogenic propellant transfer on a Starship, and the company first moved liquid oxygen between tanks on a Starship in flight in March 2024. This week’s test went far further, moving the volume a lunar mission would actually consume rather than a demonstration quantity.
The flight also continued Starship’s broader progress. The Super Heavy booster returned to the launch tower, where the mechanical arms SpaceX calls Mechazilla caught it on descent, repeating a feat first achieved in 2024. Each successful catch validates the reuse economics that underpin the entire program: hardware that lands can fly again, and only the propellant is consumed.
Why it matters for Artemis
Starship’s role in Artemis is unusual: NASA selected the vehicle as its lunar lander, and the landing profile depends on refueling in orbit. A Starship headed for the Moon reaches orbit with its tanks partly depleted; a series of tanker flights fills it before the trans-lunar burn. Estimates put the requirement at more than a dozen tanker launches per lunar mission, which is why launch cadence and transfer reliability matter as much as the lander itself.
NASA and the current administration have pushed for a crewed lunar landing within the next couple of years, and both SpaceX and Blue Origin, the other Artemis lander contractor, are under pressure to hit milestones. The propellant test removes one of the largest technical unknowns from that timeline. What remains are operational questions: how quickly SpaceX can fly tankers in sequence, and whether the transfer hardware holds up across repeated flights.
The lunar lander contract is already in hand. NASA awarded SpaceX a $2.89 billion deal in 2021 to develop Starship as the lander for Artemis III, the first crewed lunar landing, and added $1.15 billion in 2022 for a second mission. Refueling is the enabling technology for both: without the tanker flights, the lander cannot leave low Earth orbit with enough propellant to reach the Moon.
The commercial case extends beyond NASA. Refueling in orbit is what makes heavy payloads to deep space economical, and SpaceX has said the architecture could eventually cut the cost of reaching the Moon by orders of magnitude. Any customer with plans for lunar infrastructure, orbital platforms or Mars missions is now designing around a capability that only one company has demonstrated.
The IPO angle
The test lands at a moment of heightened attention on SpaceX’s finances. TechCrunch said the milestone adds weight to the case for an IPO, as investors price the company on its progress toward a fully reusable, refuelable architecture rather than on current revenue alone. SpaceX has become the world’s dominant launch provider on the strength of Falcon 9’s reusable boosters; Starship is the vehicle meant to extend that dominance into deep space and heavy payloads, the segments where competitors are weakest.
The economics turn on reusability. Each Starship is designed to fly many times, and the tanker concept means the propellant becomes the marginal cost of a lunar mission. Investors will weigh that promise against the program’s history of schedule slips and test failures, and against the billions still required to reach routine operations. A working fuel-transfer capability addresses the biggest doubt on that list.
Bottom line
The in-orbit fuel transfer is the kind of milestone that justifies Starship’s existence: a capability no other launch company has demonstrated, and one NASA’s lunar program structurally requires. It strengthens SpaceX’s hand with Artemis, with commercial deep-space customers and, if TechCrunch’s read is right, with future public investors. The next steps are repetition and cadence, turning a successful demonstration into a routine operation.
