Astronomy Picture of the Day . M45: The Pleiades Star Cluster . 9.01.2006 . ... Also known as the Sacred House of the Sun, Haleakala, is Maui's dormant volcano. ... 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. ...