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alex_antoninThe first manmade object to ever go into orbit was probably something close to a manhole cover. See, someone (probably the US) was doing underground nuclear explosion tests, and this manhole cover wasn't properly locked down. They had a camera on it for some reason though. The bomb went boom. One nanosecond the cover was there, the next it was gone. They have no proof it went into orbit, but they never found it again, never found any pieces, it was sturdy enough to survive what was essentially just being launched with a nuclear-powered air pressure gun, and according to how briefly it was on camera (when they went frame by frame), it was going several times the speed needed for escape velocity. So... someday, some alien civilization might just find a metal disc meant to cover up the entrance to an underground bunker, that came all the way from Earth.