Harrison Schmitt cancelled in September 1970, the community of lunar geologists supporting Apollo felt so strongly about the need to land a professional geologist on the Moon, that they pressured NASA to reassign Schmitt to a remaining flight. As a result, Schmitt was assigned in August 1971 to fly on the last mission, Apollo 17, replacing Joe Engle as Lunar Module Pilot. Schmitt landed on the Moon with commander Gene Cernan in December 1972. Schmitt claims to have taken the photograph of the Earth known as "The Blue Marble", possibly one of the most widely distributed photographic images in existence. NASA officially
Astronaut-politician and finishing in 6th place. Glenn returned to space on October 29, 1998 aboard Space Shuttle Discovery (STS-95) while still a sitting Senator. The next year he retired from Congress. Two Apollo astronauts were elected to the United States Congress. "Astronaut turned Sen. Harrison 'Jack' Schmitt", whose participation on the Apollo 17 mission made him the only geologist to walk on the Moon, resigned from NASA in August 1975 and shortly thereafter ran as a Republican, winning the New Mexico Senate seat in 1976 over two-term Democratic incumbent, Joseph Montoya by a margin of 57% to 42%, despite being described