... 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 . ... The December solstice brings the beginning of Winter to Earth's Northern Hemisphere and Summer time to the South! ... In the case of low-mass stars like our Sun and M2-9 pictured above . ...