Neptune's equatorial area is 155,600km.
Neptune's mass is 102,410,000,000,000,000 billion kilo, which is comparable to 17.15 x the mass of Earth.
Neptune's moon Tritan was found by William Lassel just 17 days after Neptune's discovery.
Neptune has 14 identified moons, the most significant one being Tritan.
The wind on Neptune can reach speeds of 1,240 miles for each hour. This is equivalent to 3 x the speed of Earth's worst hurricanes.
Tritan, Neptune's biggest moon by far, is expected to be torn apart in roughly 3.6 billion years due to its tidal acceleration.
The atmosphere on Neptune is comprised of helium, methane and hydrogen.
The stormiest planet in the solar system is Neptune.
Neptune is the farthest planet from the sun and it requires more than 164 Earth years to orbit the sun.
Due to the methane gas in Neptune's atmosphere, the planet seems to be blue. This actually happens partly due to the ability of atmospheric methane gas to take in red light.
Neptune features its own heat source, which is a great thing because it only gets 1/900 of the sun's energy that the Earth gets.
Even though Neptune has rings, they are incomplete and as such are thought to be arcs.
The surface heat on Neptune is -201 degrees Celsius.
Neptune features a mass 17 times higher than that of Earth's, however its mass is only 1/19th of Jupiter's.
Although Neptune has a higher mass than Uranus, it features a smaller diameter.
Pluto is the farthest planet through the sun (even though it is not technically regarded as a planet anymore), however for 20 years, starting in 1979, it actually moved nearer to the sun than Neptune due to its orbit.
Even though Galileo drew pictures of Neptune in 1612, his paintings were actually of a fixed star and not the planet. This error is the reason he is not credited with Neptune's finding.
Voyager 2 spacecraft found the Great Dark Spot on Neptune in 1989. This spot had been actually a storm system. In 1994 a new storm system had been observed by the Hubble Space Telescope.
A few of the clouds on Neptune have such a higher altitude that they cast shadows on the lower altitude clouds.
It is difficult to see Neptune with the human eye. If you attempt to find it with quite strong binoculars or a telescope, you will see a small blue disk that appears very similar to Uranus.
Wherever we discover liquid water on Earth, we discover life. Whether that water is 1000s of meters under the ground, inside glaciers or inside nuclear reactors. As long as there's water, there's life. Obviously, it's just microbial life, however still, life.
To discover life on Neptune, the planet would have to have a source of energy that bacterial life can exploit, along with a standing source of liquid water. At its surface, the temperature of Neptune dips down to 55 Kelvin. That's really cold no life can exist and there's not a way liquid water could exist.
However as you move down into Neptune's inside, pressures and temperatures boost. And there could perfectly be a point inside the planet in which water stays as a liquid and life could exist within it. Of course, this area would be 100s of kilometers beneath the surface and would be not possible for us to examine.
Right now, scientists do not know if there's any existence on Neptune and the circumstances on the planet seem extremely hostile for life. It's improbable we'll ever find any there.