Propellant Transfer Demonstration (Chaser)

Starship will lift off three to four weeks behind the other half of this two-ship test, then close on it in low Earth orbit and dock belly-to-belly. More than 10 tonnes of liquid oxygen will flow from this ship into the one already waiting there. Filling a Moon-bound Starship will take many tanker loads; this flight will test whether a single one can be moved at all.