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The acceleration of gravity on the surface of any astronomical body depends on

its mass and the distance of its surface from its center ... the 'radius'. Whatever

the nature of gravity on its surface is, that's the reason.

I was about to say "It doesn't.", but I don't know whether you consider Pluto to be

a planet any more. Mercury's gravity is more than 6 times as strong as Pluto's is.

And it's also more than double the strength of gravity on the surface of our Moon.

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12y ago

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