Which celestial body did Galileo Galilei discover to have its own moons, challenging the geocentric model?
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In 1610, Galileo turned his telescope toward Jupiter and spotted four small objects orbiting it. These are now known as the Galilean moons: Io, Europa, Ganymede, and Callisto. This discovery proved that not everything in the universe revolves around the Earth, which eventually got him into deep trouble with the Roman Inquisition. Photo: Arne Müseler, Wikimedia Commons, CC BY-SA 3.0 de.
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Source: Wikipedia (CC BY-SA)
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