discovered the four big moons of Jupiter with his first
telescope in 1610. We call them the Galilean satellites in his
honor. He impressed quite a few with the discovery, since those moons
clearly went around Jupiter, and most of Galileo's colleagues thought that
everything went around the Earth. Since Galileo's discovery astronomers
have discovered more then 55 moons, all much smaller than Galileo's four.|
The big four are called Io, Europa, Ganymede, and Callisto, and they are visible with nothing more than good binoculars. Io has active volcanoes, Europa (and maybe Callisto) a subterranean ocean, and Ganymede is the biggest moon in the solar system. Also, in this image, the Great Red Spot is visible on Jupiter.
|R G B color production was used to create this image.||
Minimum credit line: Michael Stegina/Adam Block/NOAO/AURA/NSF
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