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Artist's concept depicting the firing of the Apollo 10 Lunar Module descent engine for 42 seconds to propel "Snoopy" back into a higher lunar orbit for rendezvous and docking with the Command and Service Modules. Earlier, the LM descent engine will be fired for 27 seconds to take astronauts Thomas P. Stafford, Apollo 10 commander; and Eugene A. Cernan, lunar module pilot, to within 10 miles of the moon's surface. Astronauts John W. Young, command module pilot, will remain in the Command Module, "Charlie Brown," in lunar orbit. Developed by TRW's Systems Group at Redondo Beach, California, under Grumman subcontract, the throttleable descent engine will be used to soft land the LM on the lunar surface during Apollo 11 and subsequent Apollo missions.