These three exoplanets are among the least dense ever found, and all attempts to probe their atmospheres have been blocked by a mysterious smog.

A hazy, ultra-light “super-puff” planet, Kepler-51d, is hiding its secrets and challenging how scientists understand planet formation.

Astronomers have used the James Webb Space Telescope to capture the most detailed look yet at the atmosphere of Kepler-51d, a planet so lightweight it has been compared to cotton candy. The new data ...

Something is hiding inside Kepler-51d, and it’s doing a remarkably good job of it. About 2,615 light-years away in the constellation Cygnus, this peculiar world orbits a young Sun-like star every 130 ...

Kepler-51d is a giant, ultra-light “super-puff” planet wrapped in an unusually thick haze that’s blocking scientists from ...

Why are “super-puff” exoplanets so intriguing? This is what a recent study published in The Astronomical Journal hopes to ...

Relative sizes of the newly discovered habitable-zone planets and Earth. Left to right: Kepler-69c, Kepler-62e, Kepler-62f and Earth (except for Earth, these are artists' renditions). Image credit: ...

Launched by NASA in 2009, the Kepler space telescope was outfitted with equipment to discover and study Earth-sized planets in the Milky Way galaxy. It was named after the 17th century scientist and ...