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Why could Saturn hypothetically float in an ocean large enough to hold it?
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Saturn
Saturn and its spectacular rings, in a natural-color composite of 126 images taken by the Cassini spacecraft on October 6, 2004. The view is directed toward Saturn's southern hemisphere, which is tipped toward the Sun. Shadows cast by the rings are visible against the bluish northern hemisphere, while the planet's shadow is projected on the rings to the left.
Saturn would hypothetically float in an ocean large enough to hold it because of its remarkably low mean density. While Saturn is a colossal planet, it is surprisingly light for its vast volume, which is primarily composed of hydrogen.1
Specifically, Saturnās mean density is approximately 0.69 grams per cubic centimeter, which is about 70 percent that of water. Because its density is less than that of water, the planet would be buoyant in a sufficiently large body of water. This low density is a key characteristic that distinguishes Saturn from the denser, rocky inner planets of our solar system.123