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The strength of gravity on the surface of a planet is related to the mass of the planet, the more mass, the higher the gravity. So the smallest planet, Mercury, is the planet with the lowest gravity, 0.38 of one g or 38% of Earths gravity. There are then the dwarf Planets which are smaller and have lower gravity. Ceres is one, in the asteroid belt between Mars and Jupiter, its gravity is only 0.028g, or 2.8 of Earths. Planetary moons may smaller still, having less gravity again due to their lower mass. There are some very small moons which are only a few km across - these will have a gravity (everything with mass has a gravitational field), but this will be tiny for such a small object.

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