Cold, dark and windswept - despite its calm appearance, the ice giant Uranus is a planet of extremes. Orbiting the Sun at an average distance of 2.9 billion kilometres - more than 19 times further out ...

When Voyager 2 sped past Uranus on January 24, 1986, the spacecraft detected no significant excess heat from the planet, making it seemingly unique among the sun’s giant worlds. However ...