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Today In History (January 7 1610)
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AustrianPainter
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Today In History (January 7 1610)
TODAY IN HISTORY
1610: Galileo Galilei makes his first observation of the four Galilean moons: Ganymede, Callisto, Io, and Europa.
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fluxmaster
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Re: Today In History (January 7 1610)
That's some awfully great resolution! This is how it actually looked in Galileo's telescope.