Would geostationary satellites from a previous civilization still be orbiting in an approximately geostationary orbit? Or would they have been perturbed enough that they would either exit earth orbit or impact earth? Or pounded into dust by collisions?
If a previous civilization had metal-based moon landers, would we likely have found them/found areas with an unlikely amount of metal on the moon? Or would they have probably been obliterated by meteorites by now?
If a previous civilization had metal-based moon landers, would we likely have found them/found areas with an unlikely amount of metal on the moon? Or would they have probably been obliterated by meteorites by now?