From there, they inspected the surveys’ images and found one eligible bachelor... er, planet. The scientists are careful to ...

The planet is estimated to be 2 to 4 times the radius, and about ten times the mass of the Earth. | Credit: Mark ...

A ninth planet the size of Neptune may be hidden in the far reaches of the solar system, but the evidence has left some experts skeptical.

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 ...

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...