Planet 9

A source of speculation since the 19th Century, a new study may reignite the debate about a planet that could be lurking at the edge of our Solar System.

Scientists have previously predicted the existence of a large planet lurking in the farthest reaches of the Solar System. However, no observational evidence for this world has been found to date.

Is a mysterious planet lurking at the edge of our solar system?

Some researchers think that a hypothetical ninth planet exists in the furthest reaches of the Solar System.

The collective gravity of lots of little objects might add up to a powerful force.

"It will truly be a historical mission to take our first step into interstellar space."

The apocalypse, it seems, is upon us again.

But scientists are honing in on its location.

Scientists say the possibility a giant hypothetical planet was commandeered by the sun is "almost zero."

Scientists say an object about the size of Mars is disrupting the orbits of Kuiper Belt objects.