I am a philosophy professor at Roane State Community College in Oak Ridge, Tennessee. Planetary exploration has always been an interest of mine. You can follow me on twitter @tedstryk for the latest updates on my work, which I often post on my blog, Planetary Images from Then and Now. Please note that since the processed images are copyrighted, they should not be reused without permission. If you are interested in using any of my work, please contact me at firstname.lastname@example.org or email@example.com.
The four great satellites of Jupiter, shown here at the same size in four color observations from the Galileo orbiter. They are shown in order from outermost to innermost. The Callisto portrait was taken during Galileo's 31st orbit (I31), on August 5, 2001. Ganymede is from the C9 flyby on June 26, 1997. Europa is from E14 on March 29, 1998. Io is from C9 on June 28, 1997.