Our Apollo@50 series continues with the first truly scientific exploration of the Moon -- the Apollo 15 mission. With new hardware including an orbiting observatory platform on the Command Service Module, the first lunar rover, and an upgraded, lunar module, Astronauts Dave Scott and Jim Irwin were able to geologically explore the mountains of the Moon at the Hadley-Apennine landing site that featured 14,000 high peaks and a spectacular canyon: Hadley Rille.