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

All 19 detections of the dwarf planet 2017 OF201, from August 2011 to October 2018. Credit... Cheng et al., ... coming as close as 4.2 billion miles and moving as far out as 151 billion miles.

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

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system. The object—which orbits out beyond Neptune—has been named "2017 OF201" by the ...

Discovery of 2017OF201, a large trans-Neptune Object, challenges previous beliefs about the Kuiper Belt and hints at the existence of a theoretical Planet Nine.

Scientists have discovered a new dwarf planet candidate far beyond Pluto in the solar system. ... What makes 2017 OF201 stand out is its very stretched-out path around the sun, ...

But Pluto turned out to be too tiny — it is smaller than the moon — and was demoted to dwarf planet status in 2006. There are now four other officially recognized dwarf planets, and Cheng ...

WD 1856+534b—a freezing world with a surface temperature of -125 degrees Fahrenheit—exists where planets are normally ... core—a white dwarf. A planet orbiting far enough out from its host ...

A planet far, far away. A possible dwarf planet, ... that Planet Nine would "nudge the closest part of 2017 OF201's trajectory inward until Neptune flung it out of the solar system." ...