Harrison Schmitt credits the image to the entire Apollo 17 crew. While on the Moon's surface, Schmitt — the only geologist in the astronaut corps — collected the rock sample designated Troctolite 76535, which has been called "without doubt the most interesting sample returned from the Moon". Among other distinctions, it is the central piece of evidence suggesting that the Moon once possessed an active magnetic field. As he returned to the Lunar Module before Cernan, Schmitt is the next-to-last person to have walked on the Moon's surface. After the completion of Apollo 17, Schmitt played an active role in documenting the
Larry Taylor (geochemist) of Washington, and finally a Fulbright Fellowship at the Max-Planck-Institüt für Kernphysik in Heidelberg, Germany. In December of 1972, Taylor was offered to be in the “back room” of Johnson Space Center during the Apollo 17 mission where he had the opportunity to directly advise astronauts on their extravehicular activities on the Moon. Subsequently, Taylor became very close friends with Harrison Schmitt, the last man to step on the lunar surface and the sole geologist to ever reach the Moon. The two would collaborate throughout their careers with Schmitt playing an influential role in helping Taylor develop the Department of