On this Day in Astronomy in 1610

Hello again fellow SkyWatchers.

Just an interesting astronomy history tidbit this time – On this day 399 years ago, January 13, 1610, Galileo Galilei discovered Ganymede, Jupiter’s largest moon and the largest moon in our solar system. 

Ganymede is 5268 kilometers (3273 miles ) in diameter, which makes it much larger than both Mercury (4880 km) or Pluto (2300 km), and huge compared to our Moon (3476 km). 


Steve Nipper

Manager of Planetarium & Senior Programs

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