Is Planet Nine Alone in the Outer System?

Re:Is Planet Nine Alone in the Outer System? by yellowapple on Tuesday May 06, 2025 @09:21PM (#43911325)

The worst part of Pluto's demotion from "planet" to "dwarf planet" is the sheer disrespect toward what's arguably the most interesting planet that's not Earth.

The second-worst part is that we can't call this hypothetical trans-Plutonian planet "Planet X" anymore.

[ Parent | on HN ]

Re:Is Planet Nine Alone in the Outer System? by gs17 on Tuesday May 06, 2025 @09:43PM (#43911447)

I can settle for Planet 9 From Outer Space.

[ Parent | on HN ]

Re:Is Planet Nine Alone in the Outer System? by invalidlogin on Tuesday May 06, 2025 @10:04PM (#43911548)

The film

The operating system

The planet

The legend

[ Parent | on HN ]

Re:Is Planet Nine Alone in the Outer System? by caulkboots on Wednesday May 07, 2025 @12:05AM (#43912161)

Planet X is Eris.

[ Parent | on HN ]

Re:Is Planet Nine Alone in the Outer System? by globular-toast on Wednesday May 07, 2025 @02:58AM (#43912936)

"Planet X" was used before Pluto was discovered. The X didn't mean 10. In fact, Pluto was thought to be Planet X before they realised it was much, much smaller than that.

[ Parent | on HN ]

Re:Is Planet Nine Alone in the Outer System? by yellowapple on Thursday May 08, 2025 @11:31PM (#43933563)

The people now calling it Planet 9 instead of Planet X, as in the article, evidently didn't get that memo.

[ Parent | on HN ]