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I always assumed that doing so would simply involve somehow getting the overall mass of the planet, then taking (mass of other planet) divided by (mass of Earth) multiplied by our own Earth gravity. But today I was browsing Youtube when somebody in the comments section of a Star Wars video said that it wasn't so simple and it involved taking into account other nearby planets and the planet's moon(s).

Is this true? If so what are the factors that you need to calculate a planet's gravity?

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