A small team of planetary scientists from the California Institute of Technology, Université Côte d'Azur and Southwest Research Institute reports possible new evidence of Planet 9. They have published their paper on the arXiv preprint server, and it has been accepted for publication in The Astrophysical Journal Letters.
Unfortunately, Pluto was a victim of how hard it is/was for us to detect planets and other objects at that distance. It was the first one we saw for a while, but once we got a clearer picture, there was no way we could keep calling it a planet.
Nah, it’s easy.
Pluto is a planet.
See? Not that hard.
Edit: My bad, I thought I was in [email protected]
But then why isn‘t Ceres also a Planet? Or Eris? Or Quaoar? Or any of the other objects classified as dwarf planets
The answer is easy: Besides their size, they all behave very differently from the actual Planets. Doesn’t mean they’re any less important, they’re just something slightly different.