Neptune is the coldest planet in the solar system (not including Pluto), with an average surface temperature of -361 degrees Fahrenheit.
Neptune has 13 moons. The largest, Triton, could hold base elements for life.
Neptune is one the most hostile planets in the solar system. It is completely inhabitable by any type of life we know
Methane breakdown from atmospheric pressure result in lots of carbon atoms forming diamonds. Also, the leftover hydrocarbons form some compound similar to petroleum. Basically, You can get rich off of Neptune.
In Neptune, It rains Diamonds that go faster than a speeding bullet.
Record winds in the solar system have been recorded at over 1,300 miles an hour. That's over 5 times faster than the fastest winds on earth.
Arguably, Galileo was the first person to have seen Neptune. Although he just thought it was a fixed star, he could deserve credit for his discovery.
Triton, Neptune's largest moon, is even colder than Neptune.
Also, the gravity of Neptune probably captured Triton. It is in "Retrograde orbit", a term that is used to describe an object that is in a orbit that goes opposite of the axis of the object that it orbits. Normal orbital objects go the same way as the axis.
Triton will probably crash into Neptune in the distant future, and disengage to form more distinct rings.
Although Uranus is bigger than Neptune diameter-wise, Neptune has a greater mass.
Neptune has 7 rings, even though they are almost too faint to see.
There was a spot on Neptune called the Great Dark Spot, which has since disappeared, only to reappear on the northern hemisphere over a decade later.
There is a cloud on Neptune called "scooter", which travels around the planet once every 16 hours.
Neptune was named after the Roman God of the Sea
The magnetic field on Neptune is almost 27 times more powerful than Earth's
Neptune is about the same age as the sun, Or 4.6 billion years.
The gravity on Neptune is almost earth-like; Neptune only has 17% more gravity.