Space View larger. | Artist’s concept of the 2 “super-puff” planets, TOI-791 b and TOI-791 c. They are the puffiest exoplanets ever found so far, with densities like cotton candy. Image via NASA/ Daniel Rutter/ University of Oxford. Astronomers have discovered two more “super-puff” exoplanets, both 1,113 light-years from Earth. The planets, TOI-791 b and TOI-791 c, are close to the size of Jupiter. But their densities are like that of cotton candy.