If Planet Nine Is Lurking in Our Solar System, We Finally Know Where It Is

Planet Nine researchers respond to criticism

All evidence for Planet Nine stems from the gravitational pull it appears to have on other bodies in the outer solar system. If there's a planet, a gravitational anomaly makes sense, and all astronomers need to perform a bit of math on the affected wobbles of other nearby planets, to interpolate the new one. This is how astronomer John Couch Adams and Urbain Le Varrier discovered Neptune, when they observed Uranus exhibiting a"tugging" motion from an unseen planet.

Instead of the standard random motion, astronomers are observing clustered KBO orbits, and, while this could be a fluke, it's also a highly unlikely one. In 2016,of KBOs, and announced that the unusual clustering behavior was due to an undetected outer planet. They even calculated its mass to be that of five Earths, and roughly 10 times Neptune's distance from the sun.

, which led some to suspect it doesn't exist. The new study looks at the initial 2016 work and considers some of the criticism on the posited ninth body.One of the issues in locating a planetary body in the outer solar system lies in the inherent difficulty of locating anything out there. This forces astronomers to look wherever it's convenient, which means the clustered KBOs might be the result of biased data.

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