Galileo Galilei discovered Callisto, the fourth moon of Jupiter.
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NASA's Voyager 2 flew past Jupiter, continuing its journey towards Saturn.
After 14 years in space, NASA's Galileo spacecraft was intentionally destroyed in Jupiter's atmosphere.
Many volcanoes were discovered on one of planet Jupiter's moons called Io.
The last signal from the Pioneer 10 space probe was received.
NASA announced they would send a ship to Jupiter's moon, Europa, to look for extraterrestrial life.
