... Featured in past APODs, clockwise from.. ... Throughout our Solar System's five billion-year history, dangerous rocks and chunks of ice have continually slammed into planets and moons - usually creating numerous long lasting impact craters. When the robot spacecraft Cassini swooped past Saturn's moon Titan last month, however, radar images showed few craters. ... Spiral Galaxies in Collision . ... Stereo Phobos . ... Get out your red/blue glasses and float next to Phobos, grooved moon of Mars! ...