Somebody said they are different because of gravity.
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Your *mass* is how much stuff you’re made of. Doesn’t matter what planet you’re on because the amount of stuff in you is the amount of stuff in you, it’s the same anywhere. But note this is not about size – a bowling ball and a barrel full of hay might have the same mass, and because the stuff in a bowling ball is more dense it is smaller and because the stuff in a barrel full of hay is less dense it is larger, but both have the same mass.
Your *weight* is a how much the planet you’re on is pulling you towards it. This is combination of two things: where you are (gravity) and how much stuff you’re made of (mass). The more stuff you’re made of, the more there is for the planet to pull on. And obviously bigger planets pull harder. So a bowling ball and a feather will have different weights on the same planet because they are made up of a different amount of stuff. But a bowling ball will have different weights on different planets because each planet pulls on the bowling ball in different amounts.
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