Get a copy of What If? 2 and Randall’s other books at: https://xkcd.com/booksMore serious answers to absurd questions at: https://what-if.xkcd.com/If every h...
Depends, a lot of satellites are close enough to Earth that there’s still barely enough atmosphere to cause drag and deorbit the satellites given enough time, and they all need some flavor of orbital maintenance. Although there are the various probes we’ve sent out and the rovers too, possibly with some flavor of blinky light on them.
Do satellites count? Seems like there could be a solar panel connected to a blinky thing up there that might outlast Cesium.
Depends, a lot of satellites are close enough to Earth that there’s still barely enough atmosphere to cause drag and deorbit the satellites given enough time, and they all need some flavor of orbital maintenance. Although there are the various probes we’ve sent out and the rovers too, possibly with some flavor of blinky light on them.
I’m really hoping the answer ends up being one of the Voyagers somehow. That would just be poetic.