After a decade-long search, some scientists say a growing number of clues point to the existence of a hidden planet in the ...

A ninth planet may exist beyond Neptune in the Kuiper Belt, a region populated by icy bodies that orbit the Sun.

In 2016, scientists Michael Brown and Konstantin Batygin suggested that an unseen Planet Nine could explain the unusual orbits of some Kuiper Belt objects, sparking interest in its possible existence ...

It’s often called Planet X or Planet Nine. “If we find another planet, that is a really big deal,” said Malena Rice, an assistant professor of astronomy at Yale University. “It could ...

The solar system has nine planets, but in 2006 the International Astronomical Union declared Pluto a dwarf planet, making the ...

Astronomers are investigating the possibility of a hidden ninth planet beyond Neptune, which could explain unusual orbital patterns in the Kuiper Belt.

The search for Planet Nine, a hidden world beyond Neptune, is heating up as scientists prepare to use a powerful new telescope.

Scientists speculate if Planet Nine is a new planet or a primordial black hole. Discoveries could redefine our understanding ...

As NASCAR heads into its season finale, the series has also levied nine penalties for race manipulation in Martinsville.

While delivering remarks at the Earthshot Prize Awards on Wednesday, Nov. 6, Prince William spoke nine African languages as a sign of respect to a continent he has previously said “has always held a ...

Though fans never got to see the crew of the U.S.S. Discovery visit Risa, the pleasure planet was mentioned in two different episodes of Star Trek: Discovery. In the season 1 episode "Context Is For ...