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Re:SpaceX test flight of Starship SN-5 [video] by ben_w on Wednesday August 05, 2020 @06:24AM (#24059135)
Why count oil as the energy source for liquefying oxygen? Why not PV? Why not use natural gas instead of cracking oil?

Also, separate point: Starship return flight to Mars requires large-scale manufacture of methane from atmospheric CO2, using solar (or technically nuclear, but I don’t see that happening in this case).

It’s the only way of getting back — their tanks are empty when they finish landing on Mars — but it works fine here too.

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