#OnThisDay in #1612 #Galileo Galilei became the first person to observe the #planet #Neptune, although he mistakenly catalogued it as a fixed star.
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#OnThisDay in #1612 #Galileo Galilei became the first person to observe the #planet #Neptune, although he mistakenly catalogued it as a fixed star.
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S simonjust@mstdn.dk shared this topic