Scientists found a possible new dwarf planet — it could spell bad news for Planet 9 fans; Thayne Currie, ... Another candidate for the largest planet, HAT-P-67 b, ...

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.

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

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.

But that is still big enough to be considered a dwarf planet, lead study author Sihao Cheng of New Jersey's Institute for Advanced Study told AFP. "Lucky" discovery.

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

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

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.

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 ...

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 ...