Astronomers are on the hunt for a mysterious ninth planet, known as Planet Nine, which could change our understanding of the solar system. Is this hidden world real, or just a myth?

and Vesta as full-fledged members of our planetary system. Today, when tens of thousands of minor planets have been discovered (most residing in an "asteroid belt" between Mars and Pluto), not ...

If Brown’s hidden world is real, Rubin will almost certainly find it or strong indirect evidence that it exists. “In the ...

This 'Kuiper Belt' of minor planets beyond Neptune revolutionised our understanding of the solar system's formation and finally explained the origin of the enigmatic outer planet Pluto. This is the ...

Narrator: Serious scientists, like myself, believe our solar system was formed by the ... moons and dwarf planets such as Pluto. What's this? Oh noooo… Stella: You should know where all the ...

Since the fascinating events surrounding its discovery, it has helped increase our understanding of the origin and evolution of the Solar System, and raised questions about the ... and the role of ...

you might remember a time when we thought there were nine planets in our solar system. Our order of the solar system mnemonics were forever ruined when poor Pluto was unceremoniously booted out of ...

Pluto has had a tough couple of decades. Formerly the ninth planet in our solar system, Pluto was demoted in 2006 to a “dwarf planet.” Only 1,400 miles wide, about half the width of the lower ...

The spacecraft, located more than 24 billion kilometres away, was feared lost to the cosmic ocean after decades of travel. But, as Andrew Griffins writes, thanks to a daring feat of human ingenuity ...

It's an interesting thought experiment; while Borisov and 'Oumuamua were smaller objects, a more massive rogue planet joining our solar system could generate orbital chaos. It could potentially ...