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Which planet did ancient astronomers first believe was not a planet?

April 26, 2017ancient astronomers Astronomy believe Mathematics Planet

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Which planet did ancient astronomers first believe was not a planet?

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Unfortunately, I don’t think it was Pluto. Pluto was discovered in 1930, and if it was asking about ancient astronomers, it is doubtful that 1930 would be considered ancient. My guess would be Jupiter, only because it is so large, it could very well have been mistaken for a star or something of that sort way back when. I’m really not certain, though.