TIL that Galileo likely observed Neptune 233 years before its discovery: In two of his drawings of his observations, he plotted an object in the location where Neptune would have been on those dates. However, he likely mistook it for a star because of its slow rate of motion.

TIL that Galileo likely observed Neptune 233 years before its discovery: In two of his drawings of his observations, he plotted an object in the location where Neptune would have been on those dates. However, he likely mistook it for a star because of its slow rate of motion.

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