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

JAXA samples reveal that asteroid Ryugu has a complete set of nucleobases, the building blocks of DNA.

If we're to find extraterrestrial life in the universe, astronomers have pinpointed the best places to look for it. They have ...

Out of the 6,000 known exoplanets, it's these rocky worlds that are most worthy of attention in the search for life beyond our planet.

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