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What cotton candy and a rare type of exoplanets have in common? The answer is density. This type is called super-puff or puffy planets, characterized by being composed mostly of Hydrogen and Helium — and having an atmospheric layer of methane. The density of this type of planet is 0.1g/cm³, which is almost equal to the density of cotton candy. In this image, there’s a comparison between three puffy exoplanets orbiting Kepler 51 — a 500 million years old star that looks like our Sun — in comparison to some planets of the Solar System.
