Q:

What is the surface gravity of Neptune?

A:

Quick Answer

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.

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Full Answer

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.

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Related Questions

  • Q:

    What is the composition of Neptune?

    A:

    Neptune has no identifiable surface layer, and the icy, gaseous atmosphere eventually transitions to a slushy water and liquid ammonia ocean with a rocky, iron core at the center. As the depth increases, the intense pressure may cause methane to crystallize into diamonds.

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  • Q:

    What are the features of Neptune's surface?

    A:

    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.

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  • Q:

    How much would a 100 pound person weigh on Neptune?

    A:

    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.

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  • Q:

    What is the gravitational pull of Uranus?

    A:

    The acceleration due to gravity on the surface of Uranus is 8.69 meters per second squared. The value of this acceleration due to gravity on the earth's surface is 9.81 meters per second squared. So the gravitational pull of Uranus is 86 percent of that of Earth.

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