From what we know of planetary science, the life of stars, and evolution, I calculate - ROUGHLY - that human civilization comprises about 0.000125 of the age of our planet. Maybe we can last longer, but there are no guarantees. So, finding like creatures would be a WILD stroke of luck! More likely we will find a world with lichen on its rocks, or prehistoric algae floating in the seas. We'll hope we won't find a radioactive wasteland....
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