* Assuming that the whole planet stays intact, and that the whole core of Saturn will not slide down from the gaseous atmosphere. (I do not wish to see the destruction of the whole planet.) Saturn will only float in theory because it is lighter than water. Of course if you literally get Saturn into a tub of water, there would be a lot of issues. They are addressed in his article. But overall, for something so huge and stellar, it can still be less dense than water!