Venture capitalist Steve Jurvetson, managing director of Draper Fisher Jurvetson, has a thing for space. When he's not investing in startups like SpaceX and Tesla, he indulges this hobby. About two years ago, he began acquiring artifacts from the Apollo program.
This is a Lunar Module Descent Engine. This unit, which Jurvetson believes may be the only complete one still in existence, obviously did not go space. Those that did, stayed there.
The LMDE used hypergolic fuels: Two chemicals that combust spontaneously when mixed. On Apollo 13, the LMDE was used to push the docked Lunar Module plus Command Module back to Earth when disaster struck that mission on the way to the moon.