If we stopped sending stuff into space today, how long would it take for man-made Space Junk to stop orbiting the planet?
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Vsauce has a video on this but I can’t remember which one it was. He mentioned some satellites that were put up there to remain for as long as possible, which carried information about humanity incase we go extinct. They could keep their orbit for 10 billion years or so. So any new intelligent life form on earth (or aliens) could go retrieve it and learn about us.
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