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If the James Webb Space Telescope explodes, is there a backup?
41 votes

I want to clarify something about that "twin" of the Perseverance rover that you've mentioned, something that won't easily fit in a comment. NASA built a twin of the rover not to have one as ...

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Why don't we use catapults to get to space?
7 votes

As others have said, the scale of both the construction and the forces involved place this project firmly in the realm of the impossible. However, that does not mean the idea hasn't been considered in ...

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