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

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

Astronomers are scrambling to gather data on a mysterious object that’s currently hurtling through the solar system.

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

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

Using gravitational microlensing, scientists have discovered a rare, large planet at the edge of the Milky Way. The planet is ...

The European Space Agency (ESA) said it is monitoring an unidentified object alongside Russia identified only as A11pl3Z as it hurtles at astonishing speed from outside the Milky Way ...

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

Milky Way viewing is at its best right now, especially if you’re in the southern hemisphere. Here's what to look out for, ...

It had not been thought possible that such tiny, weak stars could provide the conditions needed to form and host huge planets.

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

Mercury’s risk of orbital disruption rises by 50–80%. There’s a 0.3% chance Mars could be lost through collision or ejection, ...