"It's really difficult to explain the solar system without Planet Nine," Mike Brown, an astronomer at Caltech who proposed ...

as Caltech planetary researchers and paper coauthors Caltech's Konstantin Batygin and Mike Brown have long claimed, relies on what are known as "trans-Neptunian objects," or TNOs, that lie beyond ...

Anomalous orbits of Kuiper Belt objects, studied since 2016 by Caltech’s Michael Brown, point to the gravitational pull of an unseen planetary body. Locating Planet X involves monitoring vast ...