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A force is a push or a pull.  One of the only forces that acts as a “pull” is Gravity. Gravity exerts a force of attraction between any two objects. The more mass (matter) an object has, the more gravity it has. Weight is the measure of gravitational force acting on an object.  This is why our weight would change on different planets—the planets are different sizes, so the strength of the force of gravity differs also.  For example, if you were to weigh 45 kg (100 lbs) on Earth, you would weight 107 kg (236 lbs) on Jupiter because it’s so much bigger than Earth.  You can check your own weight on different planets on our website!