Astronomy Picture of the Day . ... A Martian Sunset . ... You've had a hard day rolling past Martian rocks, so now just relax your APXS and enjoy the Martian sunset. The above pictures taken by Mars Pathfinder highlight how clouds vary during the end of a Martian day. ... This is particularly evident in the above close-up of the LMC's edge, which appears about as large as the full moon. ... From the surface Mars appears covered with rocks, but from orbit Mars appears covered with craters. ...