Astronomy Picture of the Day . New Year Mars Panorama . ... Also known as the Sacred House of the Sun, Haleakala, is Maui's dormant volcano. ... No one knows for sure. Iapetus, the third largest moon of Saturn, was inspected again as the Saturn-orbiting robot Cassini spacecraft swooped past the enigmatic world again late last year. ... APOD: 2006 January 1- The Largest Rock in the Solar System . ... The year 2005 began with Cassini's Huygens probe landing on Saturn's large moon Titan. ...