The Apollo 15 mission [ http://www.nasm.si. ] to Earth's Moon [ http://www.nineplan ] was dedicated to better understanding the surface of the moon by exploring mountains, valleys, maria, and highlands [ http://csep10.phys. ]. Astronauts David Scott and James Irwin [ http://www.lpi.usra ] spent nearly three days on the Moon while Alfred Worden [ http://vesuvius.jsc ] orbited above in the Command Module [ http://www.msichica ]. The mission [ http://www.hq.nasa. ], which blasted off from Earth on 1971 July 26, was the first to deploy a Lunar Roving Vehicle [ http://antwrp.gsfc. ]. Pictured above [ http://astrogeology ] in this digitally stitched mosaic panorama [ http://www.hq.nasa. ], David Scott examines a boulder in front of the summit of Mt. Hadley Delta [ http://antwrp.gsfc. ]. The shadow of James Irwin is visible to the right, while scrolling to the right will reveal a well-lit and diverse lunar [ http://www.myspacem ] terrain. The Apollo 15 mission [ http://www.lpi.usra ] returned about 76 kilograms of moon rocks for detailed study. Want to pan across the surface of Mars, too? Check out the color panoramic view [ http://www.jpl.nasa captions/image-1.htm l ] from the Spirit landing site.