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
Apollo 17 lunar sample display wish for peace and harmony among the people of the world. He explained that Harrison Schmitt, his fellow astronaut on the Moon with him, had just picked up a "very significant" Moon rock that they hoped would bring this worldwide peace through the distribution of its fragments. This basalt was later identified as lunar basalt 70017, dubbed the "goodwill rock". Once brought back, this Moon rock was broken up into small fragments and distributed in 1973 by President Richard Nixon to all the countries of the world and to the United States with its territories as a goodwill gesture. The