NASA
Nasa Space Science Data Archive: Photo Gallery: Galileo
A well-indexed collection of NASA images taken by the Galileo spacecraft. Images include the spacecraft itself prior to launch and all of the solar system objects this incredible mission has visited.
Other
Spacetech's Orrery: Comets Visitors From Afar
This site provides a report on comets, with many links to more detailed information. Content includes a focus on Halley's Comet, Hale Bopp, and Shoemaker-Levy 9.
NASA
Nasa: Io: Overview: Volcanic Moon
Find out about most volcanically active world in the Solar System, Jupiter's moon named Io.
NASA
Nasa: The Galileo Mission
This site from NASA has information on the Galileo space mission, which launched in October 1989. In spite of technical problems, Galileo transmitted enormous amounts of new data, especially about Jupiter and its satellites and rings,...