Using two infrared space telescopes and a 23-year gap, scientists may have spotted a mysterious, slow-moving object beyond ...

A team of astronomers poring through old astronomical data may have seen a candidate for the elusive Planet Nine – a ...

That will allow the observatory to detect anything that changes — like, say, Planet Nine moving across the sky. Sponsor Message "If it's there, we should be able to find it, pretty easily," says ...