Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the ...

The Solar System, home to Earth and countless other fascinating planets and moons, exists within the Milky Way galaxy. But ...

The answers to those questions depend on how we define the death of the solar system.

Imagine a journey where you could travel through the entire Solar System at the speed of light. In this video, we explore the ...

Nearly a month ago, a mysterious object was seen hurtling through the solar system and later confirmed as an interstellar ...

Evidence that rocky planets beyond Jupiter formed as rapidly, and at the same time, as the inner planets could transform our ...

Scientists have been able to recreate the extreme conditions found on icy moons in deep space—and revealed the unstable ...

International astronomers have for the first time witnessed the birth of a planetary system beyond Earth's sun that could one ...

Solar System Planets. Astronomy articles on the eight planets, plus the two dwarf planets, Pluto and Eris. Great pictures of everything in the solar system. Updated daily.