... Centaurus Galaxy Cluster in X Rays . ... Like other immense galaxy clusters, the Centaurus Cluster is filled with gas at temperatures of 10 million degrees or more, making the cluster a luminous source of cosmic x-rays. ... Comet Ikeya Zhang over Tenerife . ... The comet appears.. ... Known to some as the Elephant's Trunk Nebula, parts of gas and dust clouds of this star formation region may appear to take on foreboding forms, some nearly human. ... The Cats Eye Nebula . ... Odyssey Over Mars . ...