Astronomers studying the Kuiper Belt have detected a strange distortion that could point to an unknown planet lurking far ...

Add Yahoo as a preferred source to see more of our stories on Google. An illustration showing Planet Nine, a hypothetical, undiscovered planet in our solar system. New research now suggests the ...

Astronomers studying a rare visitor from another star system have discovered something unexpected. The interstellar comet ...

The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper’s authors have dubbed ...