New discoveries of objects in the Kuiper Belt have also presented challenges for the Planet Nine theory. The latest is known ...

Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper ...

A new study suggests the existence of Planet Y. This hidden planet may be affecting the Kuiper Belt. The gravity of Planet Y could be causing a tilt in the orbits of some icy objects. Researchers ...

For years, astronomers have searched the outer reaches of our solar system for Planet 9, a theoretical planet that could ...

In October 2017, NASA released a statement saying that Planet Nine may be 20 times further from the Sun than Neptune is, going so far as to say "it is now harder to imagine our solar system ...

If Planet 9 is real, this observatory has around a 70 to 80 percent chance of finding it, he estimates, adding that it's not a sure thing because there are so many uncertainties.

Planet 9 likely isn't a stolen exoplanet after all. New research shows the probability of ideal planet-swapping positions between young stars is near zero.

"Planet Nine explains this really well, and we do not," Madigan said. Ironically, while the new research discounts the need for an undiscovered planet, it requires the presence of thousands of ...

Planet 9 and the Weird KBO Orbits The idea of a ninth planet existing at the edge of the solar system, far beyond Neptune, was put forward in 2014.

“So, in principle, Planet Nine can be a planet, a potato, a black hole, a hamburger, etc., as long as its orbital parameters are right.” Though Batygin isn’t entirely convinced a black hole roaming ...

"Planet Nine is expected to generate some highly inclined TNOs, and BP519 is consistent with this picture," Becker said. "The findings are not 'proof,' but circumstantial evidence." ...