January 7, 1610
- Italian astronomer Galileo Galilei first observed three of the eventual four Galilean moons through his telescope:Io, Europa, and Callisto.
Wow. Four hundred years ago today, Galileo got out his telescope and observed the moons of Jupiter. There are now known to be 63 of them. Imagine how it must have been, discovering these new things which would undermine the commonly accepted model of the solar system. Exciting but scary.
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