Facts about Mars

Neptune

Neptune is the eighth and farthest known planet from the Sun in the Solar System. It is the fourth-largest planet by diameter and the third-largest by mass. Neptune is 17 times the mass of Earth, slightly more massive than its near-twin Uranus. Neptune is denser and physically smaller than Uranus, but more massive.

• Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 astronomical units (4.5 billion km; 2.8 billion mi). It is named after the Roman god of the sea and has the astronomical symbol ♆, a stylised version of the god Neptune's trident.

 Top 10 facts about Neptune

1. Neptune is the eighth and farthest planet from the Sun in the Solar System.

2. It is the fourth-largest planet by diameter, and the third-most-massive planet in the Solar System.

3. Neptune was the first planet to be discovered by mathematical prediction rather than by empirical observation.

4. It has the most powerful winds of any planet in the Solar System, reaching speeds of up to 2,100 kilometers per hour (1,300 mph).

5. Neptune has 13 known moons, the largest of which is Triton.

6. It has a unique blue-green color due to the presence of methane in its atmosphere.

7. Neptune is the only planet in the Solar System to have a Great Dark Spot, which is similar to a hurricane.

8. It has a very thin ring system composed of dust particles.

9. Neptune is named after the Roman god of the sea.

10. Neptune is roughly 4.5 billion years old.

 

BONUS

Neptune is not visible to the unaided eye and is the only planet in the Solar System found by mathematical prediction rather than by empirical observation. Unexpected changes in the orbit of Uranus led Alexis Bouvard to deduce that its orbit was subject to gravitational perturbation by an unknown planet. Neptune was subsequently observed with a telescope on 23 September 1846 by Johann Galle within a degree of the position.

Learn more about what’s in our Solar System with our Facts About Solar Winds; the planets Earth, Mercury, Venus, Mars, Jupiter, Saturn, Uranus and Moon and the dwarf planet Pluto.

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