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.

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

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

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

The discovery challenges the Planet Nine hypothesis, which suggests a massive, unseen planet is influencing the orbits of distant TNOs. While most extreme TNOs show a clustered pattern that supports ...

OF201 spends only 1% of its orbital time close enough to us to be detectable. The presence of this single object suggests ...

The researchers said 2017 OF201 was identified in observations by telescopes in Chile and Hawaii spanning seven years ...

Researchers discovered a new trans-Neptunian object, 2017 OF201, potentially a dwarf planet, in the outer solar system.

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

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