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On This Day in Space! Jan. 7, 1610: Galileo discovers 3 moons of Jupiter

Submit on Thursday, January 7th, 2021 12:10

On Jan. 7, 1610, the Italian astronomer Galileo Galilei discovered three of Jupiter’s moons: Callisto, Europa and Io. See how it happened in our “On This Day In Space” series!

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