The volcano Cauchy in Mare Tranquilitatis. Left - visible light image of Mare Tranquilitatis (site of man's first landing on the Moon), showing dark low 'plains' of basalt lava surrounded by light-colored hills of the lunar highlands. Image mosaic from LRO camera is ~1000 km across. Right - Elevations in the same area, color-coded, from the LOLA laser altimeter on LRO. The east half of Mare Tranquilitatis is revealed to be a broad dome (green), a shield volcano.