The planet Neptune is nearing the end of its first complete orbit since it was discovered in 1846.
Neptune was first discovered when observations of Uranus placed the orbit outside the path predicted by astronomers, it was then that the presence of another planet was predicted and the astronomer Johann Galle first observed it through a telescope.
"The planet Neptune was in opposition ó when the sun, Earth, and a planet fell in a straight line on August 20."
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