... Now known as supernova remnant 3C58, the region seen in this false-color image glows in x-rays, powered by a rapidly spinning neutron star or pulsar - the dense remains of the collapsed stellar core. Comet, Meteor, Nebula, Star . ... Titan Disguised . ... That moon, Titan, has a surface normally hidden from view by thick methane cloud decks. Titan Surmised . ... This bright white swath cutting across the surface of icy Jovian moon Europa is known as Agenor Linea. ...