11 June 2004: Cassini passes Phoebe, one of Saturn's outermost moons, at a distance of just 2,000 kilometres. Photographs reveal that the moon is icy, with a thin coating of dark material and many deep craters. Subsequent analysis of data from the fly-by suggests that the moon was once part of the Kuiper Belt, which lies outside Pluto's orbit and contains millions of asteroid-like bodies. This makes Phoebe a remnant from the very beginning of the Solar System. The deep craters on Phoebe suggest that violent surface impacts may have ejected material that later formed some of the 12 tiny outer moons, which were discovered orbiting Saturn in 2000.