Armstrong and Aldrin had spent two hours and forty minutes on a single E.V.A., never moving more than a few hundred feet from the LEM. Apollo 15’s lunar astronauts, Dave Scott and Jim Irwin, spent nineteen hours outside the LEM and traversed seventeen miles exploring the terrain around a 15,000-foot mountain. On Apollo 16, John Young and Charlie Duke descended to the lunar highlands and remained on the surface for three days. On Apollo 17, Gene Cernan and Harrison (Jack) Schmitt spent even longer in the Taurus Littrow area, traversing almost twenty-two miles during more than twenty-two hours
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