What is the difference between mass and size when it comes to planets?
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Mass is how much stuff is there. Size is how much space it takes up.
For example, Saturn has a diameter 9x that of Earth; as a result its volume (the space it occupies) is 729x that of Earth but its mass is only 95x that of Earth.
Fun fact: Saturn is the only planet in the solar system less dense than water so if you had a gargantuan glass of water, Saturn would float on it (assuming the glass was on a body with sufficient gravity to be pulling Saturn downwards)
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