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

Earth has a new neighbor that lives far, far away. Scientists from the Institute for Advanced Study's School of Natural ...

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

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

The object, named 2017 OF201, has a diameter of about 700 kilometers, according to a preliminary study - It is three times as ...

Asteroids are the ancient remnants of our solar system's birth, rocky fragments that never formed into planets. Most of these ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the ...

Webb’s powerful instruments have detected crystalline water ice in a distant star system, offering rare insight into planet ...

Astronomers find evidence of a possible ninth planet beyond Neptune, reigniting the debate about the formation of the Solar ...

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

James Webb Space Telescope detects frozen water in a distant young star system, revealing a Kuiper Belt–like icy debris disk.