There’s a new object in the distant reaches of our solar system, and it might just offer clues to a long-standing cosmic ...

The International Astronomical Union’s Minor Planet Center, which catalogs new moons and other small bodies in the solar ...

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

Astronomers in the United States have announced the discovery of the "10th planet" to orbit our Sun. The largest object found in our Solar System since Neptune in 1846, it was first seen in 2003 - but ...

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region ...

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

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system.

Only eight planets call our solar system home. Or there might still be ... even called it the “tenth planet” in accompanying NASA press materials. At that time it was thought to be slightly ...

One set of dots had matching colors and brightness. open image in gallery Is there a possible ninth planet in our solar system? Researchers say they may have found a candidate (Credit: ESO/Tom ...