Neptune has an equatorial circumference of 154,715 kilometers. That's almost four times more than Earth's.
Neptune is the "smallest" of the gas giant planets, with a volume of 62,525,703,987,421 cubic kilometers.
If we put Neptune on a balance, it would have a mass of 102,410,000,000,000,000,000,000,000 kilograms.
Neptune has a density of 1.64 grams / cubic centimeter, which is actually high for a gas giant planet.
Neptune has a gravitational pull of 11.15 meters / seconds squared. That means everything would feel a little heavier than it does on Earth.
Like the other gas giants, Neptune spins quickly and is able to complete a rotation in 16.1 hours.
Farthest from the Sun, Neptune's revolution takes a very long time - 164.8 earth years to be exact. No people have ever lived long enough to see Neptune go all the way around the Sun.
Neptune has a tilt of 28.3 degrees, which is similar to Earth's.
Like Uranus, Neptune is so far from the Sun that it's average temperature is -216 degrees Celsius. Nearly all substances would instantly freeze.