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Q&A Doomsday-clock for my fantasy planet

I want the surface of my fantasy planet to be made hostile every few thousand years for long enough to make every species go extinct that breeds on land. The easiest explanation seems to be other p...

6 answers  ·  posted 5y ago by anothernewnamehaha‭  ·  last activity 5y ago by anothernewnamehaha‭

Question physics gravity extinction