How were Uranus, Neptune, and Pluto discovered by scientist?
http://www.universetoday.com/wp-content/uploads/2008/09/william_herschel01.jpg William Herschel Uranus was legaly discovered in March 1781 by British astronomer Sir William Herschel. In reality there were several observations of Uranus before that, but in every case, it was mistaken as a star since it moves so slowly in the sky. The first recorded sighting was in 1690 by John Flamsteed, who spotted it at least 6 times. He cataloged it as the star 34 Tauri. The French astronomer Pierre Lemonnier also observed Uranus between 1750 and 1769. And so, on March 13, 1781, Herschel was surveying the sky with his telescope, looking for binary stars. He noticed a fuzzy disk in his telescope, and suspected that it might be a comet. Over a few nights he realized that it was moving against the background stars, but it was moving two slowly to be a comet. After doing the calculations, Herschel realized that he was looking at a new planet, the farthest ever seen from the Sun. Herschel’s original plan
