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August 1, 2025
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jan 7, 1610 - Galileo discovers the four largest moons of Jupiter

Description:

Galileo discovers the four largest moons of Jupiter
The Galilean moons are the four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto. They were first seen by Galileo Galilei in January 1610, and recognized by him as satellites of Jupiter in March 1610.

Added to timeline:

Date:

jan 7, 1610
Now
~ 415 years ago