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 travels on a ...

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach its closest point to the sun is in the year 26186.

Learn about the recently discovered trans-Neptunian object that may eventually join Pluto as a dwarf planet, found at the edge of our solar system.

Orbiting the sun from far beyond planet Neptune, the recently discovered planetoid Haumea is a fast-spinning elongated object, completing one rotation every four hours. Now, following fresh ...

There's been no discussion yet as to whether Haumea will be kicked out and another brought in, or if the definition of planets and dwarf planets could be changed again.

Dwarf planet Haumea reaches both opposition and perigee on April 20, making this a prime opportunity to see the dwarf planet in the night sky.

Just on the outskirts of our solar system exists the dwarf planet Quaoar, and recent observations of the planet found a dense ring around it, but scientists can't figure how – or why – it's ...

SHEFFIELD, United Kingdom — If you think the controversy over calling Pluto a planet is the only thing happening at the edge of our solar system, think again! Researchers say there’s a unique dwarf ...

Just on the outskirts of our solar system exists the dwarf planet Quaoar, and recent observations of the planet found a dense ring around it, but scientists can't figure how – or why – it's there.

NASA scientists used computer models to trace the origins of the fast-spinning dwarf planet Haumea. Scientists from NASA have uncovered the mysterious history of one of the solar system's weirdest ...