Astronomy Picture of the Day . A Martian Sunset . ... The above pictures taken by Mars Pathfinder highlight how clouds vary during the end of a Martian day. ... At one tenth the universe's present age, we might see galaxies forming. ... Help Aldebaran Map the Moon . ... In one of the more spectacular photos yet submitted to Astronomy Picture of the Day, Don Cooke of Lyme, New Hampshire caught the Sun, Moon, Earth, night sky, Pleiades star cluster, and Comet Hale-Bopp all in one frame. ...