Scott, David Randolph (1932-...), a United States astronaut, commanded the Apollo 15 mission that made the fourth manned landing on the moon. Scott and astronaut James B. Irwin landed in the lunar module Falcon on July 30, 1971, and stayed for nearly 67 hours. Alfred M. Worden, the third crew member, remained in lunar orbit in the command module Endeavour. Scott and Irwin explored the moon in the area of a canyon called the Hadley Rille in the Apennine Mountains. The two astronauts collected rock and soil samples.