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SpaceX's plan for in-orbit Starship refueling: a second Starship

It seems simple.
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Starship in-space refueling. SpaceX

During an update on the SpaceX Starship program, Elon Musk just showed off a brief clip that explained part of the plan for using these vehicles to reach Mars. It involved a Starship in orbit around Earth, meeting a similarly-sized vehicle to refuel before it goes on the long trip to another planet. Musk has long touted his desire to make human life "multiplanetary" and expressed this as the way to achieve his goal.

He explained the Starship only requires its "Super Heavy" booster for launches from Earth, so it seems possible that the second vehicle could launch from the Moon powered only by its own Raptor engines.

SpaceX

In a graphic, the process is explained as "Propellant settled by milli-g acceleration using control thrusters." The way Musk described it, having the ability to refuel a Starship means it can carry a full 1200 ton propellant load when leaving Earth's orbit. He also showed off an updated version of the Starship's design, with its 50m-long body covered in 301 stainless steel, with ceramic tiles in certain high heat areas.

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