Uranus is in some ways most like its neighbor Neptune, but in others it is fantastically different. While Neptune was the first planet to be discovered by mathematical prediction, Uranus was the first planet to be discovered by telescope. It was first revealed in March 1781 by English astronomer Sir William Herschel. Here the top picture shows Uranus as the human eye sees it. The bottom picture shows Uranus through ultraviolet, violet and orange filters to illustrate the contrast of gases.