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gwern comments on [LINK] Waitbutwhy article on the history and future of space exploration, SpaceX and more - Less Wrong Discussion
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Comments (26)
What's going on in your first paragraph? How did we get from spaceflight to cars?
Without bothering to read these comments, my understanding is that fuel cells are bad for cars but good for spaceships. Batteries win on energy per volume, but lose on energy per mass. Also, fuel cells can store energy for a longer period of time, but that is relevant to the outer system, not for Mars.
The linked articles cover pretty much everything, from cars to spaceflight.