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Some Facts about the Planet Neptune

Neptune is the eighth planet from the Sun and the farthest known planet in the Solar System.
It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet,
and the densest giant planet. It is 17 times the mass of Earth, and slightly more massive than its near-twin Uranus.
The video on the right shows how Neptune rotates around itself!

About Neptune

• Mass: 1.024 × 10²⁶ kg
• Equatorial diameter: 49,244 km
• Surface Gravity: 11.15 m/s²
• Average Temperature: -225°C

Some Facts about Neptune

1. Neptune's atmosphere is made up mostly of molecular hydrogen, atomic helium, and methane.
2. In 2011, Neptune completed its first 165-year orbit since its discovery in 1846.
3. Neptune is more than 30 times as far from the Sun as Earth.
4. Neptune takes 16 hours and 6 minutes to complete one rotation (one day).
5. No humans have set foot on Neptune.

Things to Know about the Planets in Our Solar System