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

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

Astronomers have uncovered a distant celestial body that may be a new dwarf planet, orbiting the Sun from more than twice the distance of Pluto. Found by researchers at the Institute for Advanced ...

Webb has captured a frigid exoplanet in a wildly tilted orbit, revealing a system shaped by past planetary violence and ...

A pair of European satellites have created the first artificial solar eclipses by flying in precise and fancy formation, ...