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

In searching for the elusive Planet Nine, researchers instead turned up a different resident in our cosmic backyard.

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

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.

Stars passing close to the sun could cause planets to collide, including with Earth, or even be ejected as rogue planets, new ...

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.

The James Webb Space Telescope has discovered an exoplanet using the direct-imaging technique. The host star's light was ...

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, ...

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." ...