They have been looking for Kuiper planet X on the cover of Scientic American last year. They ruled out a gas giant planet because it would have been bright enou

They have been looking for Kuiper planet X on the cover of Scientic American last year. They ruled out a gas giant planet because it would have been bright enoungh in infra red from the heat of self gravitation to already have been seen. The kuiper planet x modeling can only constraint to about a quarter of the sky, which is large search. By Keplers Law a highly elliptical planet x orbit would spend most of its time far out when itbis dimmest and slowest. This planet x could be 40 times further away than pluto where it could a thousand times dimmer and a hundred times slower motion across thevsky than hard to see pluto. The extinction planet x is even farther and slower.