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Q&A How many windmill rotations does it take to send a rocket to Mars?

I want to live in a pollution free world, where all creatures can breath clean air. I also want to live in a high-end space civilization, where its possible to travel to other planets in our sola...

1 answer  ·  posted 8y ago by Vingtoft‭  ·  last activity 8y ago by Vingtoft‭

Question space travel space-travel energy