The Exoplanet WASP-107b is a Real Super-Puff
The super-puff planet WASP-107b has a density so low, it was thought impossible. Evidentially not.
The exoplanet WASP-107b may be as large as Jupiter, but this super-puff planet only contains one-tenth as much mass as the king of our Solar System. The density of this world is lower than what astronomers thought possible.