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On this date: Galileo discovers three major moons of JupiterInitially believing they were distant stars, Galileo’s repeated observations over several nights and realized they were moons orbiting the gas giant. And thus, Io, Europa and Ganymede became ...
Saturn, Jupiter’s outer neighbour, currently has 83 known satellites. The four larger moons mentioned above, also known as the 'Galilean moons', account for 99.997 percent of the total mass of Jupiter ...
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