planet 9

There’s something heavy in the outer reaches of our solar system. At least, it seems that way. Hints of it are scattered across the farthest reaches of our sun’s neighborhood — that something 5 to 10 times the mass of Earth tugging on nearby objects with its gravity. No one’s ever seen it, as this phantom has eluded years of searches by telescopes. In fact, not everyone believes it’s real. For now, most astronomers refer to it as “Planet 9.” Now, the famous theoretical physicist Edward Witten has published a paper on how to track down this specter haunting our … Read more