... They're all planetary nebulae of course, glowing gaseous shrouds shed by dying sun-like stars as they run out of nuclear fuel. ... In the 1960s spring came to the southern hemisphere of Neptune, the Solar System's outermost gas giant planet. ... The formation of a black hole from the collapsing core of a massive star is thought to be heralded by a spectacular supernova explosion. ... Zooming in on the First Stars . ... APOD: 2003 June 9 Ш The Pencil Nebula Supernova Shockwave . ... First page ] Prev...