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What is a galilean moon?
Quick Answer
A Galilean moon is one of the four large moons of Jupiter discovered by Galileo in 1610. They are Io, Europa, Ganymede and Callisto.
The Full Story
The Galilean moons are Jupiter’s four largest satellites, first observed by Galileo Galilei in January 1610 with an early telescope. Their discovery was revolutionary because it showed that not everything in the sky orbits Earth. Ganymede is the largest moon in the Solar System, and Europa is famous for its likely subsurface ocean. Io is the most volcanically active body in the Solar System, while Callisto is heavily cratered and ancient.
Key Facts
1.Discovered by Galileo in 1610
2.There are 4 Galilean moons
3.Ganymede is the largest moon in the Solar System
YouTube Angle
Suggested video title for this topic:
"The four moons that changed astronomy forever"
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