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In astronomy, heavy, heaviest etc. is never used as that is a terminology for weight.

Weight is a function of an objects mass and the amount of gravity.

This is why you would weight 120lb on Earth but only 20lb on the Moon.

We therefore use the terminology "mass" as it does not have to take gravity into account.

So the most massive planet is Jupiter have more mass than any of the other planets. [See related question]

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