Galileo Discovers Jupiter's Four Largest Moons

On the 7th of January, 1610, Galileo turned his telescope to the sky and discovered that Jupiter had three moons. 

The following night, he realized the planet had four large moons - he just wasn't able to distinguish them fully during his prior observation.

In this NASA-produced video clip, Jane Houston Jones tells us more about Galileo's discovery of "Jupiter's Moons."  In it we learn that Jupiter actually has 63 confirmed moons (scroll down for the animation), the largest of which are the four Galileo observed

Today those four moons are sometimes referred to as "The Galileans."

See, also:

Galileo - Portrait, circa 1600

Galileo Reveals His Telescope - 25 August 1609

Galileo - Drawing of the Moon

Galileo - Drawings of Saturn from 1610 and 1616

Galileo - Still it Moves

Media Credits

Clip from "Jupiter's Moons," narrated by Jane Houston Jones and produced by NASA at the Jet Propulsion Laboratory (JPL) in Pasadena, California. 

Online, courtesy NASA.


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"Galileo Discovers Jupiter's Four Largest Moons" AwesomeStories.com. Oct 07, 2013. Jan 24, 2020.
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