🪐 Planet
Neptune
The farthest planet, with the fastest winds.
- Size
- 49,200 km across, 3.9 times wider than Earth
- A day lasts
- 16.1 hours
- A year lasts
- 165 Earth years
- Moons
- 16
- Average temperature
- −200 °C
- Gravity
- 1.1× Earth’s
- From the Sun
- 4.5 billion km
📍 Where is it now?
Seen against the stars of Pisces, 4.3 billion km from Earth. Its light takes 4 hours 2 minutes to reach us.
Too faint to see without a telescope.
Did you know?
- Its winds blow at more than 2,000 km/h, faster than anywhere else in the solar system.
- Only one spacecraft has ever visited it: Voyager 2, in 1989.
Photographed or visited by
Voyager 2
The only spacecraft that has ever visited Uranus and Neptune.
Compare Neptune with EarthSide by side, to scale, in the app
More NASA photos of NeptuneStraight from NASA’s image library, in the app
Explore more
All of solar system
Mercury
The smallest planet, and the closest to the Sun.
Venus
The hottest planet, hidden under thick clouds.
Earth
Our home, the only world known to have life.
Mars
The red planet, with the tallest volcano in the solar system.
Jupiter
The biggest planet, with a storm larger than Earth.
Saturn
The ringed giant, light enough to float in water.