After Stafford and Cernan docked with Charlie Brown and re-entered it, Snoopy's ascent stage was sent on a trajectory past the Moon into a heliocentric orbit by firing its engine to fuel depletion (unlike the subsequent Apollo 11 ascent stage, which was left in lunar orbit to eventually crash; all ascent stages after Apollo 11 were instead intentionally steered into the Moon to obtain readings from seismometers placed on the surface, except for the one on Apollo 13, which did not land but was used as a "life boat" to get the crew back to Earth, and burned up in Earth's atmosphere.) Snoopy's ascent stage orbit was not tracked after 1969, and its current location is unknown. In 2011, a group of amateur astronomers in the UK started a project to search for it. It is the only once-crewed spacecraft still in outer space without a crew.
After Stafford and Cernan docked with Charlie Brown and re-entered it, Snoopy's ascent stage was sent on a trajectory past the Moon into a heliocentric orbit by firing its engine to fuel depletion (unlike the subsequent Apollo 11 ascent stage, which was left in lunar orbit to eventually crash; all ascent stages after Apollo 11 were instead intentionally steered into the Moon to obtain readings from seismometers placed on the surface, except for the one on Apollo 13, which did not land but was used as a "life boat" to get the crew back to Earth, and burned up in Earth's atmosphere.) Snoopy's ascent stage orbit was not tracked after 1969, and its current location is unknown. In 2011, a group of amateur astronomers in the UK started a project to search for it. It is the only once-crewed spacecraft still in outer space without a crew.
https://en.wikipedia.org/wiki/Apollo_10