This stunning space wallpaper is a NASA Hubble Space Telescope image of Comet C/2012 S1 (ISON) when the comet was slightly closer than Jupiter's orbit at a distance of 386 million miles (621 km ...

Comet ISON shows off its tail in this spectacular space wallpaper taken on Nov. 19, 2013, using a 14-inch telescope located at the Marshall Space Flight Center. The comet is just nine days away ...