We May Have Been Visited by Relic of Early Space Age - Newser

More specifically, it appears to be the upper-stage rocket booster from NASA's doomed Surveyor 2 mission, per NASA.

Its rocket booster, however, already had disengaged and flew by the moon into space.

After astronomers in Maui spotted the object in September, Chodas ran its orbit in reverse and concluded that it likely originated from Earth in September 1966, when Surveyor 2 was launched.