In the remote outer reaches of planetary systems, far beyond the orbit of known planets, enormous and mysterious worlds silently loop around their stars. Some drift as far as 10,000 times the distance ...

For years, astronomers have been searching for a mysterious ninth planet lurking in the dark outer reaches of our solar ...

The exoplanet, a planet beyond our solar system, has been dubbed TWA 7b after NASA's James Webb Space Telescope captured ...

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

“That now applies to the outer solar system planets.” Despite their size, the grains analyzed for this study help researchers look back billions of years to help piece together the conditions and ...

A NASA Hubble Space Telescope observation program called OPAL (Outer Planet Atmospheres Legacy) obtains long-term baseline observations of Jupiter, Saturn, Uranus, and Neptune in order to ...

This discovery has significant implications for the current understanding of the layout of our outer solar system. 5 2017OF201 takes about 25,000 years to orbit the sun.

The new object, named 2017 OF201, was discovered by researchers in an astronomical image database while searching for trans-Neptunian objects (TNOs) and possible new planets in the outer solar system.

A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 years to complete one orbit around the sun. The object, known as 2017 ...

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system. The object—which orbits out beyond Neptune—has been named "2017 OF201" by the ...