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Which planet is lighter, Saturn or Neptune?
Answer 1:

The density of Saturn is 690 kg/ m3, whereas the density of Neptune is 1640 kg / m3. Hence Neptune is denser (and Saturn is lighter).

Density is the mass per unit volume.


Answer 2:

Saturn is more massive and closer to the sun, so the force of gravity (i.e. weight) that the sun exerts on Saturn is stronger than the force that the sun exerts on Neptune.



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