A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the greatest challenge yet to the hypothesis that a ninth planet lurks far from the ...

Planet 9 may be closer and easier to find than ... At its surmised brightness and orbit, Planet Nine inconveniently blends into the glittering masses of background stars—a world adrift amid the ...

Despite suggestions the planet could be due to a statistical anomaly and selection bias, the team believes the objects could be moving due to the influence of a large object beyond Neptune's orbit ...

Researchers suspect Planet Nine is out there because around a dozen objects beyond the orbit of Neptune, move as if a large object is tugging on them. I thought this turned out to be a dateset bias.

Almost a decade after astronomers proposed the existence of Planet 9, an unseen extra planet in the distant reaches of the solar system, they still haven’t all agreed whether it’s real or not ...

(Astronomers refer to a planet’s orbit as inclined when it’s not on the same plane as Earth’s.) Caltech. Related article A supernova first seen in 1181 is releasing glowing filaments.

Where Is Planet 9? ... it must be big enough that its own gravity has cleared away any other objects of a similar size near its orbit. The third criterion was Pluto’s downfall.

A small team of planetary scientists from the California Institute of Technology, Université Côte d'Azur and Southwest Research Institute reports possible new evidence of Planet 9. They have ...

The timescale in which Planet Nine would render 2017 OF 201 's orbit unstable, and kick it out of the solar system, is in the region of 100 million years. However, the process of placing 2017 OF 201 ...

A team of researchers say they have found the "strongest statistical evidence yet that Planet 9 is really out there", after studying a population of distant, unstable objects that cross Neptune's ...

If it exists, Planet Nine is likely a dark, gas or ice giant planet somewhere between five and 10 times the mass of Earth that circles the sun on a highly elliptical, or stretched, orbit — out ...