... Ice Fountains Discovered on Saturns Enceladus . ... Fountains of ice shoot out from Saturn's moon Enceladus. ... During a recent pass, Cassini was programmed to look back toward the Sun where Enceladus would appear as a thin crescent. Proxima Centauri: The Closest Star . ... What is the closest star to our Sun? ... Crab Nebula Mosaic from HST . ... In fact, the cosmic Crab is now known to be a supernova remnant, an expanding cloud of debris from the death explosion of a massive star. ...