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The amount of gravity an object has is directly proportional to its mass.

If you had 2 planets the same diameter as the Earth, one made mostly of hydrogen, the other, most lead, the Lead Earth would have much more mass, and therefore more gravity than the Hydrogen Earth.

Now real planets are a milieu of many elements & compounds. One would have to find the average density of each planet, Earth & Pluto; then find their size, then calculate their masses. Assuming that most things are equal (both planets are mostly made of rock), the Earth is larger, and thus has more mass than Pluto. So Pluto's gravitational acceleration is a lot less than 9.8m/sec/sec (Earth's acceleration).

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