A recent study introduces a potential new candidate, dubbed Planet Y, inferred from the tilted orbits of distant objects in the Kuiper Belt.

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

Amir Siraj and team propose Planet Y, a possible unseen planet influencing Kuiper Belt object orbits. Vera C. Rubin ...

Astronomers have found new evidence, revealing the existence of an unseen and mysterious planet that could be hidden in the ...

Astronomers have discovered fresh evidence suggesting the possible existence of an unseen planet in the far reaches of our ...