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.

Pluto. Due to its large mass, it would have a great internal energy that could sustain, for example, subsurface oceans. Its orbit would be very distant, much beyond Neptune, and much more inclined ...

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

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 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 ...

The race could come down to seven pivotal battleground states, and we might not know the winner tonight, so be patient and follow our live updates. 1️⃣ Planet Nine? Scientists say a growing number of ...

Planet Nine, a massive icy world, may be lurking at the outer edge of our solar system, awaiting discovery by advanced telescopes. "It's really difficult to explain the solar system without Planet ...

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