Two NASA satellites rocketed into orbit from California aboard a SpaceX Falcon 9 rocket Wednesday, commencing a $170 million ...

Stars are the fundamental building blocks of our universe. Most stars host planets, like our sun hosts our solar system, and ...

Stars passing close to the sun could cause planets to collide, including with Earth, or even be ejected as rogue planets, new simulations show.

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

Astronomers using NASA's James Webb Space Telescope have uncovered compelling evidence of a potential planet with a mass similar to Saturn orbiting the young star TWA 7.

The Last Time NASA's Voyager "Looked Back" At Our Solar System, This Is What It Saw Before it met the 30,000-50,000 kelvin wall at the edge of our Solar System, Voyager 1 took its final images.

This new dwarf planet may exist at the edge of the solar system, possibly disproving Planet Nine's existence. This is the story of that newly encountered planet.

Discover interesting facts about the sun, the solar system's central star that supports all life on Earth.

It's the largest moon of Saturn, and it's even bigger than our own moon. It's the only rocky world in the entire solar system, aside from Earth, to host a substantial atmosphere.

A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 years to complete one orbit around the sun. The object, known as 2017 ...