Fact
Saturn is less dense than water
Find a bath big enough and the planet would float in it.
Saturn’s mean density is about 0.69 grams per cubic centimetre, below water’s 1.0 – the only planet in the solar system for which this is true. It is overwhelmingly hydrogen and helium with no solid surface. The image is a thought experiment, not a scenario: the tides alone would tear both apart.