Credit: Mark Garlick/Science Photo Library/Getty Images The best candidate yet for the elusive Planet Nine has been spotted ...

The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

Caroline Delbert is a writer, avid reader, and contributing editor at Pop Mech. She's also an enthusiast of just about ...

Researchers have found a candidate for the hypothetical Planet Nine, which could be an undiscovered giant planet way out in ...

The long-theorized Planet 9, which astronomers have speculated could ... reviewed — researchers found a curious dot on infrared images taken 23 years apart that seems to be moving in a manner ...

Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, dubbed Planet Nine, could explain the unusual clustering ...

A team of astronomers believes they may have spotted a serious candidate for a ninth planet in our Solar System. This object, ...

Planet 9 would be so far from the Sun that it is just ... From there, they inspected the surveys’ images and found one eligible bachelor... er, planet. The scientists are careful to explain ...

Researchers estimated Planet Nine's expected flux and motion based ... including visual inspection of images, the team identified one strong candidate pair, where the IRAS and AKARI sources ...

The 950-foot hunk of primordial matter is classified as a "potentially hazardous asteroid," but that doesn't mean it has a ...

Planet Nine, also known Planet X ... The space agency has also encouraged the public to join the search using images captured by NASA's Wide-field Infrared Survey Explorer (WISE) mission that ...