Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

Some of the most promising places to look for extraterrestrials have remained, so far, mostly hidden from astronomers. Now a game-changing instrument called NIRPS (Near-Infrared Planet Searcher) is ...

It was almost 100 years ago that Clyde W. Tombaugh discovered Pluto. That was the last planet found until 1992, when humans found another one. But this new planet wasn't in our solar system—it was ...

Uranus, the third-largest planet in our solar system, is sometimes visible with the unaided eye. Credit: Creators.com illustration How many planets are there in our solar system? Nine? Eight? Twelve?

Scientists measured mass and distance of free floating planet drifting through space without star for first time.