The newly discovered object, 2017 OF201, has a diameter of 435 miles (700 kilometers), making it smaller than Pluto, which measures around 1,477 miles (2,377 kilometers).

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

Is there a massive undiscovered planet on the outer reaches of the Solar System? The idea has been around since before the ...

2017 OF201 is about one-third the size of Pluto, which was reclassified as a dwarf planet in August 2006, and "is likely large enough to qualify as a dwarf planet, and its orbit is extremely wide ...

Ultimately, they identified 2017 OF 201 in 19 different exposures, captured over 7 years. The discovery has significant implications for our understanding of the outer solar system.

Topline After studying thousands of computer simulations of the solar system, researchers at Rice University and the Planetary Science Institute think there’s a 40% chance an elusive “Planet ...

The researchers said 2017 OF201 was identified in observations by telescopes in Chile and Hawaii spanning seven years. "It is potentially large enough to qualify as a dwarf planet.

The team has named the celestial body 2017 OF201. Researchers say a new planet was discovered beyond Neptune. (NASA/JPL-Caltech/Sihao Cheng et al, Jiaxuan Li and Sihao Cheng/CNN/CNN Newsource) ...

A telescope has discovered a new world on the edge of the Milky Way – potentially confirming the ‘Planet X’ theory. Beyond ...