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# What are the gravity numbers of all the planets?

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The gravity numbers of other planets in the solar system refer to the gravitational force they exert on an object on their surfaces. If the Earth's gravity number is 1, then the planet Mercury has a gravity number of 0.3, Venus has a gravity number of 0.9, Mars has 0.3, Uranus has 0.8, Neptune has 1.1, Saturn has 1 and Jupiter has 2.3.

## Keep Learning

A planet that is very massive exerts a huge gravitational force only if it is also very compact. The equation that describes gravitational force increases with mass and decreases significantly as the radius of the gravitating object grows. This is why the planet Jupiter, which is much more massive than Earth, only exerts 2.3 times Earth's gravitational pull.

The sun is an object that is far more massive than Jupiter and even though its radius is also bigger, it is still compact enough to have a gravity number of 27. An example of a very massive object with a very small radius is a white dwarf star, which is the size of the Earth with the mass of the sun. It has a gravity number of 1.3 million. A neutron star is even more massive than the sun and has a radius far smaller than Earth. It has a gravity number of 140 billion.

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Saturn, like the rest of the planets in the solar system, was formed a little over four and a half billion years ago. The planets formed from a spinning cloud of gas and dust that was leftover from the creation of the sun.

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Outer planets of the solar system are made predominantly of gases. They tend to have many more moons than the inner planets, and outer planets take a shorter period of time to rotate around their axes.

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The planets in the solar system have temperatures that can often vary from a maximum to a minimum temperature, such as Mercury that has a minimum temperature of -300 degrees Fahrenheit and maximum of 870. These differences in temperatures occur because the side of Mercury that is facing the sun gets very hot since Mercury is so close to the sun, while its dark side does not experience this extreme heat.