Kepler-51 is a Sun-like star that is about 500 million years old. It is orbited by four planets—Kepler-51b, c, d and e—first three of which are super-puffs and have the lowest known densities of any known exoplanet. From Wikipedia
The discovery of Kepler-51e sheds new light on the mysteries of ultra-low-density planets and their formation around a Sun-like star.
