400

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Years, that is.  It’s the anniversary of Galileo discovering Io, Europa, Ganymede, and Callisto orbiting Jupiter.

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Read more about it here and here.

One Response to “400”

  1. In a related matter, this is one of the best ideas I’ve heard of in a while: A non-profit telescope manufacturer.

    https://www.galileoscope.org/gs/content/frequently-asked-questions

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