actually if i'm reading wikipedia correctly 10^(10^76) is conceivable under certain assumptions
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(earth doesn't fall into the sun when it becomes a red giant, no nucleon decay through any mechanism, no false vacuum collapse or big crunch or big rip, earth flung out of solar system before it spirals into the sun, earth flung out of galaxy before it falls into black hole)
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and then given all that, it's the high end estimate. still though that's an insanely long time
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i should clarify that i mean it might spontaneously exist for that long even after civilization dies out
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allegedly after 10^65 years everything quantum tunnels into perfect spheres. maybe that means there will be a huge number of planets? technically
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(i don't know how the orbit clearing requirement affects that though)
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Around 10^9 tho you start running into real identity problems; is it really still "Earth" if the biosphere has completely boiled away and the crust is molten again?
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hmm, i'd say if it's a ball made of mostly the same atoms then it's still earth
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