An unusual planetary system with three known ultra-low density "super-puff" planets has at least one more planet, according ...

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 in ...

How many exoplanets are in the cosmos and what can they tell us about planetary formation and evolution? This is what a ...