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Author: WikiMatrix
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English[en]
Because Neptune moves very slowly and is very faint relative to other known planets of that time, Galileo mistook it for a fixed star, leaving the planet undiscovered until 1846.
Chinese[zh]
由於海王星的移動速度相對於其它當時已知的行星非常緩慢,使伽利略誤認它是一顆恆星,使這顆行星至1846年才正式被發現。