News Planetary Science A possible new dwarf planet skirts the solar system’s edge The faraway object travels in a weird, wide orbit A newly discovered object called 2017 OF201, likely a dwarf planet, travels in an extremely wide elliptical orbit (yellow), a new study suggests. The orbit of the dwarf planets Sedna and Pluto are shown for reference. Tony873004/Wikimedia Commons (CC0 1.0) By McKenzie Prillaman June 6, 2025 at 11:00 am A possible cousin of Pluto seems to be circling the far reaches of the solar system. The dwarf planet candidate 2017 OF201 travels in a superwide orbit, with the sun relatively near one end of its huge elliptical path, researchers report in a paper submitted May 21 to arXiv.org. Its route differs from those of other distant large objects in a way that may challenge the idea that the solar system houses an undiscovered planet. For around a decade, researchers have been hunting for a planet beyond Pluto, demoted to a dwarf planet in 2006. The gravitational pull of an unknown giant planet — dubbed Planet Nine or Planet X — could explain the clustered orbits of several faraway objects, whose routes are all roughly oriented the same way. Sign up for our newsletter We summarize the week's scientific breakthroughs every Thursday.