Uranus was the first planet that scientists could locate with a telescope. Herschel and his colleagues first looked at what is now the seventh planet of the Sun as a comet or star.
The blue-green ice giant has confronted science with many puzzles. The distance to its home star is so great that a complete orbit takes 84 Earth years. Because of the enormous distance, astronomers find it very difficult to observe and study Uranus.
The Voyager missions were enormously important for the raw data.