In rare find, astronomers identify a planetary sextuplet where six members of the system circle their star in a harmonious pattern with orbital periods that occur in simple, whole-number ratios ...

According to his models, to explain the clustering and movement of other objects in the Kuiper belt, Planet 9 would need an orbit tilted roughly 15 to 10 degrees from the plane of the solar system.

From Stardust To Planets: The Beginning Of A Solar System According to Popular Science, roughly 4.5 billion years ago, a massive cloud of gas collapsed under its own gravity, forming our Sun.

This mismatch “doesn’t mean it’s not there, but it means it’s not Planet 9,” Brown said. “I don’t think this planet would have any of the effects on the solar system that we think we ...