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.

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, ...

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 ...

This is probably the most convincing evidence for Planet Nine so far. It is believed that this planet is five to ten times ...

Scientists using data from the James Webb Space Telescope, have made an astounding discovery. They believe extraterrestrial ...

The predawn morning sky is now as interesting as the evening sky with super-bright Venus and medium-bright Saturn gracing the ...

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

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