Bothell, Wash.-based Portal Space Systems shows off the lab where its solar thermal propulsion system will be developed.

Astronomers have discovered four planets that are just a fraction of the mass of Earth orbiting Barnard’s Star, which is 6 ...

Floating around at the edge of the Solar System are leftovers from its formation. This is the Kuiper Belt, which is composed ...

The Radcliffe Wave is a massive, undulating structure filled with dense clouds of gas and dust, stretching across several ...

The James Webb Space Telescope (JWST) has directly imaged four planets orbiting the host star HR 8799 about 130 light-years ...

One million alien visitors from another star system could already be lurking in the solar system. We aren't talking about ...

"We have observed giant gas planets, such as Jupiter or Saturn, but in another solar system," explains the leader of this research on the HR 8799 system, located 130 light-years away. The study ...

Early in our Solar System’s history, bits of icy debris were scattered and then gradually coaxed into a spiral alignment in ...

The James Webb Space Telescope has captured its first direct images of carbon dioxide in a planet outside the solar system in ...

If we achieve advanced nuclear, antimatter propulsion or other advance propulsion it would be possible to achieve near ...

Interstellar material has been discovered in our solar system, but researchers continue to hunt for where it came from and ...