For years, astronomers have toyed with the idea that the Sun hides an extra planet so distant and dim that even the best ...

Astronomers claim to have discovered a new ninth planet in our solar system, according to research led by Terry Long Phan ...

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

Astronomers have spotted a small rocky planet that orbits perilously close to its host star disintegrating as its surface is ...

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

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

The possibility that an additional planet may be hidden far into the solar system was touted more than a century ago. In 1983 ...

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

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

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