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(This is why the engines for Starship are designed to use methane).
The raw energy required to make that fuel, using ANY conceivable process, is extreme though. What energy solution has been proposed? How much solar acreage do you need? How will you keep the dust off the panels? Will there be any option other than sending panels from earth?
All the needed prereqs have zero practical knowledge with them. Nobody has even had the chance to work out kinks yet. It doesn't matter how much elon wants to do something, new shit takes a lot of time, money, and effort to shakedown.
No one, because it hasn't been required or even feasible yet. We don't have the ability to send that sort of payload to Mars yet.
> How will you keep the dust off the panels?
I hear Tesla is working on a humanoid robot.
Assuming there are people involved, give them a broom. ;)
It's mostly made of iron and steel, that we have here on earth in abundance.
One day, the economics of return trips will work out. But to begin with at least, all trips will be one-way.
It's highly unlikely that trips with humans on board would be one-way.
