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Q&A How large does an object have to be to cause global extinction?

I've been trying to explain the origins of a fantasy world I've been constructing. So far, I have the idea of a Promethean (advanced race of aliens) Penal ship crashing (probably from an internal u...

2 answers  ·  posted 6y ago by Celestial Dragon Emperor‭  ·  last activity 6y ago by Celestial Dragon Emperor‭

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