NASA
Nasa Space Science Data Archive: Ice on Europa
With the exception of Earth, Europa currently appears to be the only body in the solar system which potentially harbors a global ocean of liquid water. The possibility of liquid water raises the possibility of life, as well. This NASA...
NASA
Nasa Space Science Data Archive: Photo Gallery: Ganymede
NASA offers acollection of the best images of Ganymede taken by Voyager and Galileo spacecraft. Includes links to all Voyager and Galileo images and information about the missions. Full captions for each image provides lots of...
NASA
Nasa Space Science Data Archive: Photo Gallery: Europa
This NASA page is a collection of thumbnail images of Europa taken by the Voyager and Galileo missions. Thumbnails link to low and high resolution image files and complete caption files. Images are excellent examples of various surface...
NASA
Nasa: Callisto 3 Images
This site from NASA provides a complete collection of images during orbit 3 of Jupiter's moon Callisto. Also links to data released from all Galileo orbits to date. Check the "Family Portraits" of the Galilean moons and other images at...
University of Oregon
University of Oregon: Io, Moon of Jupiter
Statistics and general information about the volcanic moon of Jupiter. Good comparison, with graphics, of Io's volcanoes and Earthly geysers.
NASA
Nasa: Io: Overview: Volcanic Moon
Find out about most volcanically active world in the Solar System, Jupiter's moon named Io.