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

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

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 ...

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

"Legend has it that somewhere beyond Neptune and Pluto 15 actors who made the biggest comebacks in the history of Hollywood I ...

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

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

Indiana University of Pennsylvania’s Cejka Planetarium in John J. and Char Kopchick Hall will host two programs during the ...

Indiana University of Pennsylvania’s Cejka Planetarium in John J. and Char Kopchick Hall will host two programs during the ...