This icy world, temporarily named 2017 OF201, could be a distant cousin of Pluto ... beyond the Kuiper Belt, where the object is located, has previously been thought of as fairly empty. NASA's New ...

A newly detected planet beyond Pluto is not just expanding our understanding of the Solar System, it might be quietly rewriting it. Astronomers from the University of Taiwan recen ...

This distant world could potentially ... is currently journeying beyond the Kuiper Belt, the region where Pluto resides. However, even New Horizons has yet to reach the outermost reaches of ...

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 fair—but one of the largest yet discovered and with an orbit around the Sun that ...

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

Scientists say a new planetarium show about the Milky Way has helped them unlock one of the solar system’s many secrets.

Scientists hunting for the hypothetical Planet Nine have discovered a potential new dwarf planet, 2017 OF201, in the outer solar system. This object, ...

A 700km-wide object, 2017 OF201, has been found orbiting far beyond Neptune. It could reshape our understanding of our solar ...