“Its location at the edge of the solar system makes it a bit of a black hole from a knowledge point of view,” Dr. Craig O’Neill once said of the planet ...

Astronomers surveying the outer solar system have revealed that a rare object far beyond Neptune is moving in sync with the eighth planet in an unexpected way. Called 2020 VN40 and first discovered in ...

Introduction]A cold, icy planet 4.5 billion kilometers from the Sun, where even light barely reaches—that is Neptune, the ...

ZME Science. For years, astronomers have wondered whether another huge planet is lurking unseen in the cold darkness beyond ...

Astronomers used a telescope in Hawaii to find a new object on the outer edges of our solar system, helping to fuel evidence of a long-standing theory about Planet Nine, or Planet X. For years, ...

Planet 9 is the hypothetical ninth planet in our Solar System. Has it finally been found using IRAS and AKARI mission data?

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. The solar system suddenly has a new member. A new object ...

Add Yahoo as a preferred source to see more of our stories on Google. Digital art of distant planet - Dottedhippo/Getty Images On August 24, 2006, our solar system lost a planet. It wasn't by ...

Neptune's strange moon and ring system has puzzled astronomers for decades. Researchers have used data from the James Webb Space Telescope (JWST) to help explain how it may have formed. The study ...