Apollo 15 Lunar Module Falcon set down on the Hadley plains. The goals: sample the basalts that compose the mare deposit, explore a lunar rille for the first time, and search for ancient crustal rocks. Dave Scott and Jim Irwin deployed the third Apollo Lunar Surface Experiments Package and unveiled the first LRV. The ALSEP consisted of several experiments that were powered by a RTG and sent back valuable scientific data to the Earth for over six years after the astronauts left.