Which of these celestial objects would actually float if you could find a bathtub big enough to hold it?
Correct
Saturn is the ultimate space rubber ducky! Because it is primarily made of gas rather than dense rock or metal, its average density is actually lower than that of water. Mars is a dense, rocky world that would sink like a stone. The Moon is also a solid, rocky body, so it would head straight to the bottom of the tub. The Sun is incredibly massive and dense at its core, making it a very poor candidate for a bubble bath experience.