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

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.

Nearby in the collection

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About as hard as this one

Scored closest to it by the model behind our guide to solving cryptograms.

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