Moons of Jupiter

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Part of the SummerGame2016 Game

When it comes to moons, Earthlings have it easy — just one moon to keep track of. That's nothing like the headache of trying to keep track of Jupiter's moons, which seem to multiply mysteriously all the time — and occasionally even disappear. There are at least 63 that we know of. Most are small, rocky, inert worlds. And a few are probably asteroids that were gravitationally captured when they wandered too close to jupiter. Let’s take a look at the first four to be discovered by Galileo - the Galilean moons - Io, Europa, Ganymede, and Callisto. What is the title of his book in which his discovery was first described?

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