Saturn is the only planet in our Solar System that is less dense than water, so if put it in a giant container full of water, it would float on the surface! Saturn is composed of 97% Hydrogen gas, about 3% helium gas and about 0.05% methane, plus ammonia. You could not stand on its surface because it's gaseous. Despite its scarce density, the planet is the second largest in the Solar System, after Jupiter.
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