Ever since Pluto was demoted from planet status, astronomers believe a real Planet Nine exists in the solar system ...

There could be a ninth planet in our solar system that's lying in wait to be discovered - and no, it's not Pluto. Our solar system has eight planets but in recent years, astronomers have theorised ...

Our solar system used to have nine planets ... objects beyond Neptune’s orbit that also happens to be the former ninth planet’s neighborhood. The 2005 revelation set off a chain of events ...

The discovery of some of these dwarf planets has given us reasons to believe that something else might be lurking on the outskirts of the solar system. It's no coincidence that astronomers spend ...

Other researchers, such as Konstantin Batygin and Michael Brown, argue that an unseen planet several times larger than Earth could be "shepherding" smaller objects in the solar system. Batygin and ...

We may soon find out. Is there a 9th planet out there? We may soon find out. Earth is a geological oddball in our solar system. This is why. Earth is a geological oddball in our solar system.

On a clear night, several planets in our solar system were visible without a telescope ... Another possibility is the telescope doesn’t identify a ninth planet but finds more distant objects than what ...