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

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

Astronomers may have found a candidate for Planet Nine. This planet is beyond Neptune. The finding could be the first ...

At a frigid -125 degrees Fahrenheit (-87 degrees Celsius), WD 1856+534 b is the coldest planet ever directly observed, ...

There have been questions about a mysterious ninth planet in our solar system for nearly a decade. Pluto was unseated as ...

The ongoing search for an additional planet at the solar system's edge has identified a new candidate, potentially ...

Spotted thanks to a fleeting light distortion in 2011, a mysterious duo — a tiny star and its hefty companion — has turned ...

NASA scientists have sought to understand planet Jupiter, the gas giant whose mass is more than the rest of the planets in ...

NASA is also tracking two other asteroids near Earth today, including a larger bus-sized one called "2025 HR1" that's ...