Signals from a distant world have pushed the search for alien life out of science fiction and into the realm of testable ...

The third known visitor from another star system, Comet 3I/ATLAS, has been racing through the Solar System with just enough ...

In doing so, they found this orphan is within the same weight class as Saturn, strengthening the case that the galaxy teems ...

Their analysis showed that the planet lies about 3,000 parsecs, or just under 10,000 light-years, from Earth. Its mass is ...

What seemed like new planets around Fomalhaut were actually expanding dust clouds from violent planetary collisions seen by Hubble.