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Neptune was predicted by astronomers be observing the effects of its gravity. Neptune was discovered in 1846 by Johann Gottfried Galle.
The 8th planet : Neptune.
Astronomers now realize that Pluto does not have nearly enough mass to noticeably affect the orbits of Uranus or Neptune.
Neptune
Astronomers predicted the existence and orbit of Neptune based on discrepancies in the orbit of Uranus. These discrepancies suggested the gravitational influence of another planet beyond Uranus, leading to the discovery of Neptune in 1846.
Astronomers used observational and mathematical skills to discover Neptune. They observed irregularities in the orbit of Uranus and calculated the gravitational influence needed to explain these irregularities, leading them to predict and discover the existence of Neptune.
The god of oceans and seas.
Neptune
Astronomers had noticed unexpected changes in the orbit of Uranus: the only explanation was another planet. Detailed study of the orbit of Uranus led to estimates about the size and location of Neptune.
Astronomers believe Triton may have been a planet that was captured by Neptune because it orbits in the opposite direction of Neptune's rotation and is tilted compared to the planet's other moons. This suggests it did not form in place with the other moons of Neptune, but rather was captured later in the planet's history.
omg y wont it give me the answer
Astronomers knew that Neptune existed before they could see it because they observed that the other planets orbited the sun in a way that could only be explained if they were being influenced by the gravity of another object of such mass. So the astronomers contemplated that there must be another planet somewhere that was changing the orbits of other planets. That planet is today called Neptune.