Saturn is so light for its size that if you could find an ocean large enough, the entire planet would float, because its average density is lower than that of water.

Saturn’s average density is about 0.687 grams per cubic centimetre. Water sits at roughly 1. On that measure alone, Saturn is the only planet in the Solar System with an average density lower than water, a point NASA states plainly on its Saturn facts page. That figure is the source of a line repeated in [...] The post Saturn is so light for its size that if you could find an ocean large enough, the entire planet would float, because its average density is lower than that of water. appeared firs