A powerful new tool comes online this year that could help astronomers locate the mysterious planet hiding somewhere beyond ...

There are eight official planets (sorry, Pluto) in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and ...

Experts told Live Science the new telescope at Vera C. Rubin Observatory in Chile could find the elusive ninth planet, nicknamed Planet Nine, in the next few years or rule it out for good. Mike ...

Astronomers are on the hunt for a mysterious ninth planet, known as Planet Nine, which could change our understanding of the solar system. Is this hidden world real, or just a myth?

An curved arrow pointing right. Astronomers say they've discovered a ninth planet 200 times farther from the Sun than Earth. Produced by Emmanuel Ocbazghi. Original Reporting by Jessica Orwig.

NASA’s shocking claim hints at a hidden planet, possibly 10 times Earth's size, or a primordial black hole. Gravitational ...

Most astronomers would love to find a planet, but Mike Brown may be the only one proud of having killed one. Thanks to his research, Pluto, the solar system’s ninth planet, was removed from the ...

“Because Pluto is rotating rapidly prior to the collision, and because Charon lies mostly outside of their corotation zone, it is able to ‘push’ Charon off, and Charon starts to slowly migrate out,” ...

The potential discovery of a large planet beyond Neptune’s orbit could change everything we know about the Solar System.

The solar system may be hosting a ninth planet that is about 10 times bigger than Earth and orbiting far beyond Neptune, according to research published in the Astronomical journal.

She, like her fellow soldiers, do not remember anything about the Ninth Planet - their real memory has been erased, and false memories have been implanted instead.