Not all planets are small compared to stars. Some grow so massive they approach stellar size, challenging how astronomers ...

For centuries our solar system was the only planetary system known to humans. We had no proof other worlds existed beyond those in our own cosmic backyard, and we imagined that if other planetary ...

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 ...

In a surprising twist to our understanding of exoplanetary systems, astronomers have uncovered three Earth-sized planets orbiting a binary star system known as TOI-2267. This rare configuration, ...