Did you know that the planet Saturn could float on water...? It's true, and just to be clear, I am talking about the second largest planet in the solar system, not the car.
For and object to float on water it simply has to have less density than water. Density is the mass of the object (weight/gravity) divided by it's volume.
Density of Water ~ 1g/cm^3
Density of Saturn ~ 0.7 g/cm^3
Hard to imagine a planet 95 times more massive than Earth, with a volume 769 times that of Earth floating only 3/4 submerged in a giant bath tub!
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