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 odd dwarf planet Quaoar might have a brand-new moon. Observations of the tiny world, made by a pair of astronomers in California, suggest it possesses either a second satellite or a third ring.

Typically, from what astronomers have gathered thus far, star systems follow a tidy logic: small, rocky worlds huddle close to the warmth of their star, while massive gas giants bloat up in the colder ...

Astronomers studying a distant solar system have uncovered an unexpected cosmic arrangement that could challenge long-standing theories about how planets form and evolve. Using the ...

Astronomers have found a distant world that challenges planetary formation theory, with a rocky planet where gas giants should be.

When you buy through links on our articles, Future and its syndication partners may earn a commission. New research based on NASA's Dawn mission data suggests the dwarf planet Ceres, once deemed ...

One of the longest stellar dimming events ever observed was likely caused by the gigantic saucer-like rings of either an unseen brown dwarf or "super-Jupiter" blocking its host star's light, ...

Scientists have detected methane gas glowing faintly above Makemake, an icy dwarf planet smaller and farther than Pluto in space. Until now, Pluto was the only object that far out in the solar system ...