... What would it look like to peer into one of the volcanoes currently active on Jupiter's moon Io? ... 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. ... This image from the Hubble Space Telescope reveals the Cat's Eye Nebula to be one of the most complex planetary nebulae known. ... Odyssey Over Mars . ...