Kepler-51: A Stellar System That Defies Expectations The Kepler-51 system, located about 2,600 light-years away in the constellation Cygnus, has puzzled astronomers since its discovery.The system ...

Illustration of the Kepler-51 system and its inner three planets, which have unusually low density. New observations from NASA's James Webb Space Telescope suggest that at least one more planet is ...