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Galileo Galilei discovered the first three satellites of Jupiter
Italy
January 7th, 1610
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Galileo Galilei
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Jupiter
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satellites
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moons
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Callisto
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Io
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Europa
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universe
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solar system
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Aristotle
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Ptolemy
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geocentrism
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helIocentrism
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expansIon
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philosophy
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astronomy
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cosmology
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on this day
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Edwin Hubble
