... The Dust and Ion Tails of Comet Hale Bopp . ... Since it peaked on the other side of the Earth's orbit, however, the comet appeared only brighter than any comet in two decades. ... Jupiter, Io, and Shadow . ... Just as planets orbit our Sun, Jupiter's Moons orbit Jupiter. Pictured above is the closest of Jupiter's Galilean Satellites, Io, superposed in front of the giant planet it circles. ... NGC 1850: Gas Clouds and Star Clusters . ... Summer at the South Pole . ... Simulated Supergiant Star . ...