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> it's better to have them closer together so that you don't have fuel in space being heated by the sun for days.

A hydrogen stage for Soviet N-1 rocket was designed so that it would be used near the Moon. The shelf life was going to be about 11 days (I think astronautix.com has this datapoint).

Starship is bigger, and methane/LOX is hotter than liquid hydrogen. Will it be storable for a month?..









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