This narrowed down Planet Nine's location to somewhere in the most distant 22% of its orbital pathway. Unfortunately, ...

At such a distant location it would not support life as we know it, because the temperatures would be too cold. There are "Planet Nine sceptics", said BBC Earth. Some experts believe "it isn’t ...

Speculation swirls as scientists debate if Planet Nine is a celestial body or something darker. Clues emerge from unexplained gravitational anomalies far beyond Neptune. A radical hypothesis ...

Planet Nine, a massive icy world, may be lurking at the outer edge of our solar system, awaiting discovery by advanced telescopes. "It's really difficult to explain the solar system without Planet ...