Scientists have identified an object about 700km wide inhabiting the frigid outer reaches of our solar system that might ...

For instance, Neptune migrated outward, switching places with Uranus, and pushed a lot of the small, icy bodies into the ...

Scientists have recently spotted a huge object far away in the cold outer reaches of our solar system. This ...

Discovery of 2017OF201, a large trans-Neptune Object, challenges previous beliefs about the Kuiper Belt and hints at the ...

Less than 1% of this dwarf planet candidate's orbit is close enough to detect, which means astronomers are lucky to have ...

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

Cheng discovered the object as part of an ongoing research project to identify TNOs and possible new planets in the outer ...

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

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

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.

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