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Q&A What size object could wreak havoc on a world but not "destroy" it?

So what size comet/meteor/rogue planet could wreak havoc on a populated world without killing off intelligent life entirely or actually ruining the planet for life? Assume the world being affected ...

4 answers  ·  posted 8y ago by Skelter‭  ·  last activity 6y ago by Skelter‭

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