... Orbiting in the plane of Saturn's rings, Saturnian moons have a perpetual ringside view of the gas giant planet. ... The thin rings themselves slice across the middle of this Cassini snapshot from April 2011. ... Waterfalls, Auroras, Comet: Iceland . ... Dust Pillar of the Carina Nebula . ... The broad dust tail of Comet PanSTARRS (C/2011 L4) has become a familiar sight for many northern hemisphere comet watchers, as the comet fades but rises higher above the western horizon after sunset. ... April ...