Neptune

Part of Solar System Milky Way

The farthest planet from the Sun, with the fastest winds in the Solar System.

Deep blue Neptune with a dark oval storm and white streaks of cloud. — Image: NASA/JPL

Neptune was found in 1846 with mathematics before anyone saw it, from the way it tugged on Uranus. Its winds reach more than 2,000 km/h.

Key facts

Type: Ice giant
Distance from the Sun: About 4.5 billion km (30 AU)
Diameter: 49,244 km
Day: 16 h 6 min
Year: About 165 Earth years
Moons: 16 known (2025)

Mercury
The smallest planet and the closest to the Sun, scorched by day and frozen by night.
Venus
Earth's twin in size, and the hottest planet in the Solar System.
Earth
Our home planet, and so far the only world known to have life and liquid water on its surface.
Mars
The red planet, with the tallest volcano and one of the longest canyons in the Solar System.
Jupiter
The biggest planet, more than twice as massive as all the others combined.
Saturn
The ringed gas giant, sixth planet from the Sun and light enough to float in a big enough bathtub.
Uranus
An ice giant that rolls around the Sun on its side.