... Saturnian Aurora . ... X-Ray Earth . ... Why does the Earth have an x-ray glow? ... M82 s Middle Mass Black Hole . ... And after years of pondering black holes as either stellar mass objects seen in binary star systems or enormous supermassive black holes at the centers of galaxies, astronomers now have strong evidence . Comet LINEAR: Fade To Black . ... The seasonal recurrence of the ozone hole was expected, although the size of the hole has never been so large this early in the season. ...