Far beyond Neptune, something heavy appears to be tugging on the outer solar system, bending the paths of distant icy worlds ...

Mike Brown is convinced that beyond Neptune, at the far reaches of our solar system, there's an unseen giant planet. "This is the 5th largest planet in our solar system, lurking out there, waiting to ...

Some experts believe that the solar system's hypothetical ninth planet could be just a few years away from being discovered. If this is the case, how long would it take for humans to send probes to ...

After a picture-perfect launch of twin Escapade spacecraft bound for Mars, Blue Origin's New Glenn rocket aced landing on a recovery vessel floating in the Atlantic, helping power a revolution in ...