Astrogeology Science Center

Portion of global color mosaic of Io
Portion of global color mosaic of Io
Portion of global mosaic of Europa
Portion of global mosaic of Europa
Portion of global mosaic of Callisto
Portion of global mosaic of Callisto

The Galileo spacecraft is best known for its discoveries on Io, Europa, Ganymede, and Callisto. But it was also the first spacecraft to fly by an asteroid, the first to discover a moon of an asteroid (Dactyl, the moon of asteroid 243 Ida), and the first to observe an impact into a planetary body when comet Shoemaker-Levy 9 collided with Jupiter in July 1994. USGS Cartographers Tammy Becker and Lynn Weller and Geologist Dr. Paul Geissler used data from the Galileo and Voyager Missions and the Integrated Software for Imagers and Spectrometers (ISIS) software to generate global mosaics of the Galilean satellites. Lunar products were also generated from data acquired from Galileo's flybys of the Moon in 1990 and 1992.