While other planets were discovered through observations of the sky, Neptune was discovered using mathematical predictions. Uranus wasn’t traveling as astronomers had expected so a French mathematician suggested that an unknown planet was changing the orbit of Uranus. And he was right!
Because Neptune is so far away from Earth, it is invisible to the naked eye. Its blue colouration comes from the methane gas in its atmosphere.
Neptune is named after the Roman God of the sea because of its colour.
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