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Saturn is less dense than water, so a bath big enough to hold the planet would let it float.

Astronomy Facts, sourced to NASA.

What it means

The planet is mostly hydrogen and helium, spread over an enormous volume, and its average density works out to around seven tenths that of water. The image of a floating planet is a useful way to feel the number, though it falls apart if you push it, since a bath that size would have gravity of its own and the water would not stay put. Saturn is the only planet here that is lighter than water.

The claim comes from NASA, and the page it comes from was read on 2026-08-27 to confirm it still says this.

This is not the kind of claim that goes out of date, which is why it was set as a puzzle rather than a fact with a shelf life.

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