This is an old article. It references the Batygin and Brown paper from 2016. As of 2024, it is still considered possible, but no direct evidence has been observed, and alternative explanations have been proposed, according to Wikipedia.
Things are looking pretty grim for planet nine, it’s running out of places to hide. It was a cool hypothesis and a gutsy prediction, but I’m afraid that it’s not going to work out.
Won’t the Vera Rubin Telescope (formerly LSST) settle this? It’s going to observe the entire night sky every few nights and provide enough data to find nearby moving objects.
This paper seems to be dated 18 April, 2024. Wouldn't surprise me if its some sort of re-print, but otherwise would explain why this topic popped up in the media over the last few days. https://arxiv.org/pdf/2404.11594.pdf
This hypothetical planet was cooler when it was called "Planet X."
Is this the one they've decided exists and then narrow down the parameters as what it must look like every time a survey rules out another patch of sky?
It'd be cool to see direct evidence of it.
Petition to name it Xluto
Home of the Lectroids.
So they found Nibiru