Outbound mosaic of Mercury

Outbound mosaic of Mercury

. After passing on the dark side of the planet, the departing spacecraft looked back at the sunlit hemisphere of Mercury and photographed these images that have been assembled into a mosaic. It shows large tracts of smooth plains, that may be due to extensive volcanism or the splashed-out debris from large impacts. Partially visible along the day-night terminator (left) is half of the Caloris basin (above center toward the top), a gigantic multi-ringed impact scar. (Courtesy of JPL and NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University