Astronomers using NASA's Hubble Space Telescope data confirmed a new class of "super-puff" planets with their density as low as that of cotton candy. Astronomers found three of these 'super-puffs' located in the Kepler 51 star system about 2,400 light-years away from Earth. "The fluffy globes are the lowest density exoplanets ever discovered beyond Earth's solar system," researchers said.