As much as I hate to play Devil's advocate, Majic_Abe...
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Ok, when earth gets dissolved and destroyed when the sun goes kaboom, mars is gone to(I'm actualy laughing my head off you think we'd survive on mars).
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The sun will actually turn into a red giant long before it goes kaboom and, hence, it will slowly warm the inner planets. While Earth becomes inhospitably warm while Mars becomes comfortably warm.