Planet 7 of 8
Uranus
The tipped-over ice giant
Knocked onto its side by an ancient collision, Uranus rolls around the Sun with poles that face sunlight for 42 years at a time.
Quick facts
- Type
- Ice giant
- Distance from Sun
- 19.2 AU
- Diameter
- 50,724 km
- Mass
- 14.5 × Earth
- Surface gravity
- 8.87 m/s²
- Day length
- 17.2 hours
- Year length
- 84 Earth years
- Moons
- 28
- Average temperature
- -195 °C
- Composition
- Water, methane and ammonia ices over a rocky core
Fun facts
- Its axial tilt is about 98 degrees — it orbits on its side.
- Methane in the atmosphere gives it a cyan colour.
- It has the coldest measured atmosphere in the Solar System.
- Only one spacecraft, Voyager 2, has ever visited.