Discovered in 1930, Pluto was long considered our Solar System's ninth planet, but was unseated in 2006 after the discovery ...

Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, ...

Researchers say they found a curious dot on infrared images taken 23 years apart that seems to be moving in a manner consistent with a large, distant planet.

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

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

Using two infrared space telescopes and a 23-year gap, scientists may have spotted a mysterious, slow-moving object beyond ...

What’s the deal with semiconductors? You might be wondering why semiconductors became so hot, and what shifting from “From ...

If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

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

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

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

TAIPEI (Taiwan News) — Six of Taiwan’s universities ranked among Asia's top 100 educational institutions according to Times ...