The surface gravity of Neptune is 36.6 feet per second squared, or 11.5 meters per second squared. A person weighing 100 pounds on the Earth would weigh about 114 pounds on Neptune.Continue Reading
The mass of Neptune is more than 17 times greater than the Earth. By comparison, if the Earth were reduced to the size of a nickel, Neptune would be the size of a baseball.
Neptune is a gas giant composed of water, ammonia and methane surrounding an Earth-sized solid core. The atmosphere is mostly hydrogen, helium and methane.
Neptune is the eighth planet and is the farthest from the sun. It was the first planet whose existence was predicted from mathematical calculations before it was observed through a telescope.Learn more about Planets
Unlike other planets, Neptune does not really have a solid surface; it is made up of gases while its interior is made up of a rocky core, which is very hot. Neptune is quite unique since it glows even without sunlight. Most planets shine as a result of sunlight bouncing off of their surface.Full Answer >
Neptune has no definite surface, only a layer of gas above a layer of ice and water. While the planet has a core of rock and metal, Neptune's mantle consists of an ocean that contains more than 10 times the mass of Earth.Full Answer >
A 100-pound person who stood, or floated, on the surface of Neptune would weigh 114 pounds. Although Neptune is much more massive than Earth, it's far less dense, so the acceleration of gravity at its surface is weaker than expected for a planet that is 17 times Earth's mass.Full Answer >
The average surface temperature on Neptune is minus 329.8 degrees Fahrenheit, close to its effective temperature of minus 353 degrees Fahrenheit. Neptune is among the coldest planets in the solar system.Full Answer >