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 ...

Exoplanet WASP-189b has revealed a direct chemical link between stars and planets, giving scientists new insight into how ...

Dying stars may be wiping out nearby giant planets as they expand into red giants. Astronomers found that these close-in planets become increasingly rare around more evolved stars, suggesting many ...

It wasn’t all that many years ago that you could go to a major astronomy meeting and hear the latest news about galaxies and supernovas and quasars and the Big Bang — but nothing at all about planets ...

For decades, our solar system was thought to have nine planets, with Pluto considered the smallest and farthest. But in 2006, Pluto was officially reclassified as a dwarf planet by the International ...

In early 2025, the world observed a rare planetary parade event that won't be seen again until 2040. On the last day of February, seven planets appeared to align at the same time, creating a rare ...

Astronomers have revealed new evidence that there are not just one but four tiny planets circling around Barnard's Star, the second-nearest star system to Earth. Astronomers have revealed new evidence ...

Scientists have discovered that a highly unusual giant planet—sometimes called "forbidden"—could have an atmosphere with ...