42 years after the first moon rover transported the Apollo 15 astronauts over the lunar terrain, here are a selection of NASA photos taken by Apollo 15 commander David Scott and Lunar Module pilot James Irwin during their wheeled 1971 lunar adventure while Alfred Worden, command module pilot, remained in orbit about the moon. Shown here, after three highly successful EVAs, Scott walks away from the first ever Lunar Roving Vehicle (LRV), a location where it remains to this day.(All photos are sourced from NASA's excellent Human Spaceflight Gallery: http://spaceflight1.nasa.gov/gallery/index.html)
An artist's concept of the Apollo 15 Hadley-Apennine landing area showing the two moon-exploring crewmen, Scott and Irwin, driving on the lunar rover.
The lunar rover was attached to the lunar module and lowered to the surface and unfolded by the Apollo surface crew. When packed, the rover took up a volume of only four cubic feet.
Scott and Irwin drive the Lunar Roving Vehicle trainer called "Grover" during a simulation of lunar surface extravehicular activity in Taos, New Mexico.
Scott (right) and Irwin test out the lunar rover before the Apollo 15 mission to the moon at Kennedy Space Center (KSC), Fla., in May 1971.
Gover is driven up to the edge of a man-made crater in Cinder Lake crater field in Arizona to simulate the lunar landscape.
On July 31, 1971, the first lunar rover is unpacked during the first surface extravehicular activity (EVA) at the Hadley-Apennine landing site on the moon. The lunar module, "Falcon," is shown here with the rover and lunar module pilot James Irwin.
The lunar rover on the moon's surface.
Irwin photographs Scott on board the lunar rover during an Apollo 15 EVA.
The US flag is unfolded and planted toward the end of the Apollo 15 mission; Irwin salutes.
The rover was an invaluable workhorse during the Apollo 15 mission, boosting the scope of how much of the lunar landscape around the Hadley-Apennine landing site the astronauts could explore.
Scott works at the Lunar Roving Vehicle during the third Apollo 15 EVA.
The rover parked on the edge of Hadley Rille while Scott works.
Irwin stops the lunar rover from sliding downhill during the second Apollo 15 lunar EVA. Both of the rover's rear wheels appear to be off the ground. Scott was working on a fresh crater at the Apennine Front (Hadley Delta Mountain) when the vehicle started to slide down the 20 degree slope. Fortunately, the rover was stopped and the astronauts were able to continue their work.
The lunar module stands alone at the Apollo 15 landing site, lunar rover tracks revealing the paths taken by the two NASA explorers.