Neptune had been discovered in 1846 because of irregularities in the orbit of Uranus, but, in many ways, its discovery was fortunate, as it was much closer to Uranus than either Le Verrier or Adams had assumed. Le Verrier was not convinced that Neptune was the limit of the solar system, and said so to Galle on 1st October 1846, but he recognised that finding a yet more distant planet would be considerably more difficult than finding Neptune.
KeywordsDust Depression Mercury Titan Hydrocarbon
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