Weight is equal to mass times gravity. Your mass is constant (unless you eat lots!) so your weight only changes with the gravity of the planet you are on. The stronger the gravity the more you would weigh and the less the gravity the less you would weigh.
BUT a bigger planet does not always have more gravity. The gravity of a planet depends on its mass and not on its size. So a planet made of feathers would have less gravity than a planet of the same size but made of metal. Even though the planets are the same size, the planet made of metal would have more gravity because it would have more mass
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