Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

The monsterous 85-mile-wide comet C/2014 UN271 isn't just the largest icy rock in the Oort Cloud, it's the second most ...

Astronomers have announced the discovery of a new dwarf planet in our solar system, named 2017 OF201. Located far beyond Neptune, it orbits the sun every 25,000 years.

The chance of a planet forming in the outer reaches of the solar system – a hypothetical Planet Nine – could be as high as 40 ...

There has been a lot of back and forth about the existence of a mysterious ninth planet, often referred to as "Planet Nine" ...

The dwarf planet's existence also opens the likelihood of many more like it in our solar system waiting to be found. From our morning news briefing to a weekly Good News Newsletter, get the best ...

This artist’s illustration provided by the European ... can help us understand how conditions beyond our solar system may yield planets vastly different from our own, said study author Thomas ...

WASHINGTON (Reuters) -The James Webb Space Telescope has observed two large planets at different stages of infancy - one with ...

Carbon dioxide has been detected on a planet outside our solar system for the first time. The gas has been observed directly by the James Webb Space Telescope on four exoplanets, all belonging to ...

Hycean worlds are also called ocean worlds. They're planets covered in oceans that also have thick hydrogen atmospheres.