On July 4, 2005, the Deep Impact spacecraft arrives at Comet Tempel 1 to impact it with a 370-kg (~820-lbs) mass. On impact, a crater is produced expected to range in size from that of a house to that of a football stadium, and two to fourteen stories deep. Ice and dust debris is ejected from the crater revealing fresh material, from which the core study may be conducted.

The Hubble Space Telescope has snapped a picture of a 400-km-high (250-mile-high) plume of gas and dust from a volcanic eruption, caused by the Pele Volcano on Io, Jupiter's large innermost moon., Read about and view High Quality Images of jupiters most interesting of its two moons ........... IO. (pronounced eye-oh)

This link will bring you to a clickable graphic map of all the known moons in our solar system, you may also use this map to compare the sizes of all the moons to one another.