Learn about the recently discovered trans-Neptunian object that may eventually join Pluto as a dwarf planet, found at the ...

Astronomers have announced the discovery of a new dwarf planet in our solar system, named 2017 OF201. Located far beyond ...

A small team led by Sihao Cheng, Martin A. and Helen Chooljian Member in the Institute for Advanced Study's School of Natural ...

The unusual orbit of a possible dwarf planet, known as 2017 OF201, makes it less likely that our solar system contains a ...

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...

There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be ...

The International Astronomical Union’s Minor Planet Center, which catalogs new moons and other small bodies in the solar system, announced the discovery on May 21. At roughly 435 miles wide, 2017 ...

On May 21, the International Astronomical Union’s Minor Planet Center announced the discovery of 2017 OF 201, which, because ...

T he Solar System has just gotten a new official member. Currently, with the name of 2017 OF 201, this is a trans-Neptunian ...

The new object could also challenge the hypothesis that there's a "Planet X" or "Planet Nine" beyond Pluto, with gravity affecting dwarf planets and other objects in the Kuiper Belt. That's ...