A 9th planet in our solar system might be found — and no, it’s not Pluto - Is there another planet out there? Researchers say ...

I/ATLAS, earlier known as A11pI3Z, is only the third interstellar visitor to be discovered passing through our corner of the ...

Only eight planets call our solar system home. Or there might still be nine if some astronomers are correct about an as-yet undiscovered large body out past Neptune.

How far away it is: 93 million miles (150 million km) ...