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Neptune is the eighth planet to the sun at a distance of around 45 x 10^8 kilometers in the Solar System and the fourth-largest planet by diameter, while the third-largest by mass. It has an equatorial diameter of 49,532 kilometers or 30,760 miles.

It takes 165 years to complete one full cycle around the sun and 16 hours and 6.7 minutes for a complete revolution. It was discovered by Johann Gottfried Galle and Louis d’Arrest in 1846 through mathematical predictions rather than empirical prediction. Neptune was visited by only 1 spacecraft, Voyager 2 in 1989. Out of all gas giant Neptune is the outer most one.


  Do you know/ Interesting facts:
  > Neptune has a shorter day than the Earth.

> It has the second longest year. It takes one hundred sixty-five Earth years for Neptune to make one complete orbit around the Sun.

> Fastest winds in the solar system is near the Great Dark Spot, its up to 1,200 mph

> Neptune is the smallest of the gas giants

> Neptune’s surface gravity is almost Earthlike

> Neptune is the coldest planet in the Solar System

> Neptune has only been visited once up close

> Neptune, sometimes, orbits the Sun further away than Pluto, making it the most distant planet in the Solar System. It returned to its usual position, as the second farthest planet from the Sun, in December 1999.

> In Roman Mythology, Neptune is the God of the Sea.