Scientists think there may be a ninth planet hiding in the distant reaches of the solar system — and a new telescope could finally prove its existence. | Credit: Nicholas Forder for Live Science Deep ...

Planet Nine, the undiscovered planet at the edge of the solar system that was predicted by the work of Caltech’s Konstantin Batygin and Mike Brown in January 2016, appears to be responsible for the ...

Astronomers know very little about the far outer Solar System — beyond Neptune, Pluto, and the far-flung Kuiper belt. For the past seven years, some scientists have observed certain gravitational ...

A long-standing mystery in the Solar System might have been solved thanks to the help of an unlikely (and unconfirmed) object: Planet Nine. The rest of this article is behind a paywall. Please sign in ...

The mysterious Planet Nine may have up to 20 moons that could be superheated by the hypothetical planet's gravitational pull, making them easy to spot. When you purchase through links on our site, we ...

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

Earlier this year scientists presented evidence for Planet Nine, a Neptune-mass planet in an elliptical orbit 10 times farther from our Sun than Pluto. Since then theorists have puzzled over how this ...

The solar system still has only eight confirmed planets that are orbiting the sun. It recently had nine planets, but it all changed after NASA and other space agencies decided to demote Pluto to a ...

The 2019 science fiction thriller Dark Encounter (now streaming on Peacock!) starts in the winter of 1982 when Ray and Olivia return to their home and find that their 8-year-old daughter Maisie is ...

When I was a kid, there were nine planets. Now we know of thousands! But that includes exoplanets, alien worlds that orbit alien suns. Only eight planets call our solar system home. Or there might ...

On June 3, six out of the nine planets in our solar system will be visible in the predawn sky. Tryfonov - stock.adobe.com On June 3, those of us in the Northern Hemisphere with clear skies and a ...