Planet Y? Astronomers find fresh clues

[+thexfile Subscriber²]

“One explanation is the presence of an unseen planet, probably smaller than the Earth and probably bigger than Mercury, orbiting in the deep outer solar system,” said lead author Amir Siraj, an astrophysicist and a doctoral candidate in the department of astrophysical sciences at Princeton University. “This paper is not a discovery of a planet, but it’s certainly the discovery of a puzzle for which a planet is a likely solution.” Siraj and his coauthors reported their findings in the journal Monthly Notices of the Royal Astronomical Society: Letters.

Planet Y is the latest in a series of hypothetical solar system planets that scientists have proposed in recent years

https://edition.cnn.com/2025/10/03/science/planet-y-solar-system-study

 

 

[+Edouard Subscriber²]

Planet Y? I thought was called Planet 9 or Planet X.

[+thexfile Subscriber²]

I thought it was X too, but they now call it Plant Y.

[Rigby]

First I've heard of planet Y, so I asked my AI friend about it. Apparently X and Y are two different things.