A dark scar floats during the extreme southern hemisphere of Jupiter in this Hubble Space Telescope image. The scar appeared in July 2009, the likely result of a rocky asteroid ramming into the giant planet. In this image, the scar, which consists of dark material blasted onto the planet's cloudtops, is wider than Earth. Amateur astronomers have observed at least two smaller impacts on Jupiter since this one. The planet's dynamic atmosphere quickly swallows them, however. [NASA/STScI]