Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

For years, astronomers have been searching for a mysterious ninth planet lurking in the dark outer reaches of our solar ...

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have discovered a new planet in our solar system.

Moons and other matter. More than 150 moons orbit worlds in our solar system. Known as natural satellites, they orbit planets, dwarf planets, asteroids, and other debris.

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

For centuries, astronomers have sought to understand the formation and evolution of the solar system and the dynamics that govern it. In particular, there is the long-standing question of whether ...

The sun is unique in that it's the only star in our solar system. Up to 85% of stars have at least one companion star. The sun contains over 99% of the mass of our entire solar system.

Given just how big space is, the solar system seems like it shouldn't be too mysterious. But there are actually plenty of questions that took years to solve.

Space artists can sometimes stretch scientific data for a bigger visual bang. At New York's natural history museum, they ...

The NSF-DOE Vera C. Rubin Observatory is set to revolutionize our knowledge of the solar system's "small bodies" -- asteroids, comets and other minor planets.