Journey to the mystery planet: why Uranus is the new target for space exploration

The last time a probe visited the distant ice giant was in 1986, yet learning more about this cold world could tell us a lot about the galaxy

On the night of 13 March 1781, William Herschel was peering through his telescope in his back garden in New King Street, Bath, when he noticed an unusual faint object near the star Zeta Tauri. He observed it for several nights and noted that it was moving slowly against background stars. The astronomer first thought he had found a comet but later identified it, correctly, as a distant planet. Subsequently named Uranus, it was the first planet to be discovered since antiquity. The achievement earned Herschel membership of the Royal Society, a knighthood and enduring astronomical fame.

Studies have since shown Uranus to be a very odd world. While the rest of the planets in our solar system spin like tops, Uranus lies on its side. And although it is not the farthest planet from the sun, it is the solar system's coldest.