Does 'Planet Nine' Exist? Astronomers Say An Unseen Disk of Icy Space Rocks May Explain Things

For years, some astronomers have suspected that a planet lies beyond Neptune’s orbit in the far reaches of our solar system — a mysterious, giant planet dubbed “Planet Nine.” That theory is based on the strange orbital motions of small, distant worlds that behave like some unseen object is influencing their movements. But now a group of researchers has come up with another way to explain these orbital oddities. In research published in the Astronomical Jour