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Submission + - Happy 400th Anniversary Jupiter's Galilean Moons!

krswan writes: Ok, the moons themselves are much older, but on January 7, 1610 Galileo first observed "4 fixed stars" surrounding Jupiter. Continuous observations of their changing positions led Galileo to postulate they were really moons orbiting Jupiter, which became further evidence against Aristotelian Cosmology, which led to problems with the Roman Catholic Church, etc... Jupiter will be low in the southwest (in the Northern Hemisphere) after sunset this evening — nothing else around it is as bright, so you can't miss it. Celebrate by pointing binoculars or a telescope at Jupiter and checking out her moons for yourself.
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Happy 400th Anniversary Jupiter's Galilean Moons!

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