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.

Researchers found the object named 2017 OF201 while searching for "Planet Nine" - a hypothetical planet thought to exist ...

For the unversed, "Planet Nine" is a hypothetical planet which is reportedly larger than Earth that is thought to orbit ...

A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 ...

A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system ...

As a result of the International Astronomical Union’s 2006 demotion of Pluto from planet to dwarf planet, our solar system ...

The researchers called it one of the most distant visible objects in our solar system, and said its existence indicates that a vast expanse of space beyond the outermost planet Neptune and a region ...

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

A newly identified dwarf planet, named 2017 OF201, has been discovered in the distant outer reaches of the solar system.

Discover interesting facts about the sun, the solar system's central star that supports all life on Earth.

Scientists have discovered a colossal object approximately 435 miles wide in the frigid outer reaches of our solar system, ...