WASHINGTON (Reuters) -Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it ...

Scientists are intrigued after spotting a highly unusual celestial object lurking at the very edge of our solar system. It's ...

Astronomers have identified a new trans-Neptunian object, 2017 OF201, located far beyond Pluto. Its enormous size, comparable ...

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...

At the very edge of our solar system, beyond the grasp of Neptune and even past the icy sprawl of Pluto’s domain, a new ...

There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be ...

"This is the 5th largest planet ... of small Pluto-like bodies. The cosmic weirdness could be explained by the gravitational effects of a large planet. But no one has actually spotted Planet ...

The discovery of other objects about the size of Pluto in distant reaches of the Solar System sealed its fate. Pluto was relegated to the catalog of minor planets ... did not fly past Pluto ...

The decision was felt most by Clyde Tombaugh, who spotted ... While major planets make roughly circular orbits, Pluto carves out a “sweeping ellipse.” Some wanted to call it a minor planet ...

(CNN) — Astronomers have discovered three previously unknown moons around Uranus and Neptune, the most distant planets in our solar system. The find includes one moon spotted orbiting Uranus ...

The discoveries were announced today by the International Astronomical Union's Minor Planet Center ... back to an object that was spotted near Neptune in 2003 but lost before it could be confirmed as ...