Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

The planet is about 690 miles wide, making it the seventh largest trans-Neptunian object, while former solar system planets Pluto and Eris are the biggest in the region.

With a width of about 2,377 kilometers, Pluto, the biggest dwarf planet, is significantly larger in comparison. This means 2017 OF201 is quite big but still much smaller than Earth.

Ceres is the largest object in the asteroid belt between Mars and Jupiter and the only dwarf planet located in the inner solar system. In 2015, it became the first dwarf planet to be visited by a ...

Pluto, the largest of those dwarf planets, has a diameter of about 1,477 miles (2,377 km). The mass of 2017 OF201 is estimated to be about 20,000 times smaller than Earth's and 50 times smaller ...

A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

Pluto, the largest of those dwarf planets, has a diameter of about 1,477 miles. Don't miss out on what's happening! Stay in touch with breaking news, as it happens, conveniently in your email inbox.

Dwarf planet Eris, similar in size to its better-known cosmic cousin Pluto, has remained an enigma since being discovered in 2005 lurking in the solar system's far reaches. While Pluto was ...

Makemake is the third-largest known dwarf planet in our solar system, after Pluto and Eris, with a diameter of 888 miles across. It takes about 309 years to orbit the sun.

Pluto, the largest of those dwarf planets, has a diameter of about 1,477 miles (2,377 km). The mass of 2017 OF201 is estimated to be about 20,000 times smaller than Earth's and 50 times smaller ...