The newly discovered super-puff exoplanets are also called 'cotton candy' exoplanets because they're so lightweight. They have the lowest density ever found outside of our solar system.
Picture a world made out of cotton candy, and you can add"super-puff" to the list of weird and wonderful exoplanet types. This new type of exoplanet is the lowest density ever found outside of our solar system.
When astronomers used the Hubble Space Telescope to study the Kepler 51 star system, which is about 2,400 light-years away from Earth, they spotted something unusual: puffy planets orbiting a sun-like star in the system first seen by NASA's Kepler mission in 2012. But new observations by Hubble allowed researchers to better understand their mass and density.
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