Apollo 15 was the fourth American space mission to land on the moon. Commander Dave Scott and lunar module pilot James Irwin landed in the Apennine Mountains near a deep canyon known as Hadley Rille and brought back many lunar samples, including one known as the "Genesis Rock" for its great age. While they worked on the lunar surface, command module pilot Al Worden remained in orbit around the moon.
In February 2010 the Explorers learned about the early days of the United States manned space program and the motivations and efforts that led to the moon landings.