It's far out, man – literally. Researchers have uncovered the most-distant celestial object in the solar system, a pink dwarf planet nicknamed "Farout," detect at a distance of more than 100 times ...

While searching for the mysterious Planet X that some astronomers believe lurks on the edge of our solar system, researchers instead found an extremely distant object they dubbed “the Goblin.” And ...

Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously ...

Astronomers hunting for Planet Nine have found some 50 new objects lying beyond the orbit of Neptune – including a few that may help them track down this elusive, distant world. The new discoveries, ...

Scientists discovered an extremely distant object billions of miles beyond Pluto. The object has an orbit that hints at an even-farther-out “Super-Earth” or larger “Planet X” that could be lurking out ...

There are officially eight planets in our Solar System — yes, I know, Pluto was totally a planet, but not anymore — but that doesn't mean there isn't something lurking on the edge of our system that ...

A newfound object nicknamed "The Goblin" lurking in the far reaches of our solar system could be yet another clue that points us toward the discovery of the theoretical Planet X, or Planet 9 -- a ...

Astronomers photographed a baby planet, WISPIT 2b, during its formation process within a dusty ring around its star system.

Way past Pluto, the suspected Planet X creeps around the outer edges of our solar system. Nobody is sure whether this rumored ninth planet really exists, but astronomers have been hard at work ...

Just because Pluto was ruled out as a planet in 2006 doesn’t mean our solar system only has eight planets. The search for Planet Nine is far from over as scientists continue to uncover clues ...

Planet-hunters scouring the heavens have found thousands of distant worlds around other stars, but astronomers may have overlooked one lurking much closer to home. Scientists searching for glimmers of ...

Astronomers have discovered an extremely cool object that could have a particularly diverse history; although it is now as cool as a planet, it may have spent much of its youth as hot as a star. The ...