Neptune
Ice giant
The farthest planet from the Sun, a cold blue ice giant with the fastest winds in the Solar System.
Key facts
- Type
- Ice giant
- Diameter
- 49,528 km
- Average distance from the Sun
- 4,515 million km
- One orbit
- About 164 Earth years
- One day
- About 16.1 hours
- Known moons
- 16 (NASA)
About the Neptune
How to recognise it
Neptune is blue with bright white clouds and dark storm spots. Our Voyager 2 image from 1989 shows the Great Dark Spot, a storm that later disappeared.
What it is like
Neptune is about 30 times farther from the Sun than Earth, so one orbit takes about 164 years. It is an ice giant like Uranus. Its largest moon, Triton, orbits backwards.
Sources
Facts checked: 29 October 2026
