The equatorial radius of Neptune is 24,766 km.This makes the planet a little less than four times larger than Earth
Neptune spins in 16h 6m at the equator. That’s not quite as fast as Jupiter or Saturn, but faster than any of the terrestrial planets.
Neptune orbits the Sun at an average distance of 30.0 A.U. It receives about a thousand times less radiative energy from our central star.With an orbital period of 165 years, Neptune has just now orbited once around the Sun since being discovered in 1846.
Neptunes' outermost layers consist of hydrogen and helium gas. But below that, there is a deep layer of ice, primarily H2O, but with methane and ammonia in the mix as well.There is also a slight amount of other, more exotic compounds.
Uranus has a strange, tilted magnetic field that is off-centered as well. It is thought that the conducting fluid that create Uranus’ magnetic field is highly compressed water.