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In 1781, William Herschel, viewing the sky, recognized that an object in the constellation of Gemini ... . At first, he thought he was looking at a new comet, but upon further investigation realized ... .
Herschel named his discovery ‘the Georgian planet’ after his patron, George III. Other names proposed included Herschel and Uranus. Eventually, ... . Uranus is similar in composition to Neptune, and both ... larger gas giants Jupiter and Saturn.
In the 19th century, it became evident that the orbit of Uranus did not ... . Many astronomers began to question whether Newton’s theory applied to an object so far from the sun. However, two astronomers, John Couch Adams in England and Urbain Le Verrier in France, both independently came up with the theory ... by a more distant planet.
Working to Le Verrier’s calculations, astronomers at the Berlin Observatory ... . They had discovered the eighth planet of the solar system, Neptune. It was observed on 23 September 1846 by Johann Galle, and its largest moon, Triton, was discovered shortly thereafter, though none ... telescopically until the 20th century.
After the discovery of Neptune, astronomers ... the solar system for a ninth planet. In 1930, an American astronomer discovered ... , Pluto.