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For those who are a trifle confused, basically it's the mass and density rather than volume (size) that contributes to gravity.
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But density is a product of mass and volume.
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I was a confused trifle, because Jupiter is a gas giant and Oddworld is a terrestrial planet, it seems fair to assume Oddworld has a similar density to the terrestrial planets in our solar system.
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The density of the terrestrial planets, moons and planetoids in our solar system vary significantly. Generally, the larger they are, the denser they are, since its own gravity squeezes the planet smaller until the outward pressure of its matter equals the gravitational pull. Mercury bucks this trait by almost being as dense as Earth, the densest body in the solar system.