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In a way, size does not effect a planet's "gravity", its mass does. The more mass a planet has, the stronger its gravitational force.

But the "surface gravity" is affected by the radius of the planet. That's because it depends on the distance of the surface from the center of the planet.

The important equation here is based on Newton's Law of Gravitation:

Gravitational Force = G x M x m / d x d (where G is the Gravitational constant,

M is the planet's mass, m is the mass of an object being attracted, and d is the

distance between the centers of the masses).

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12y ago

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