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

It's only the third time that experts have spotted an object in the Milky Way that's come from a different solar system. Find ...

For only the third time in history, astronomers have detected a new interstellar visitor — an object from another star — blitzing into our solar system.

The European Space Agency (ESA) said it is monitoring an unidentified object alongside Russia identified only as A11pl3Z as ...

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

The Milky Way's core will be visible this month and through August. Here's what Tennessee stargazers should know.

An initial analysis suggests the object could be a young, cold planet with a temperature near 120 degrees Fahrenheit, NASA ...