Ghost in the Darkness
This image shows a lava flow that has filled in a neighboring crater (top right), leaving only a trace of the covered crater rim at the surface. These filled craters are referred to as ghost craters. The lines seen forming a network of cracks across the surface are called troughs . Troughs formed as the lava flow cooled, and the surface was cracked and faulted.
Date acquired: April 03, 2012
Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington