Sednoids and the Mysterious Missing Planet X

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1958 Solar System poster, 1888 wood engraving for Flammarion's pop science book, B movies, Superman comics. (https://dc.fandom.com/wiki/Kryptonian_Science_Council http://sacomics.blogspot.com/2010/11/jor-els-life-story.html)

As I've said before, this isn't the world I grew up in.

Holf Weiher's Euler Diagram: IAU Executive Committee labels for objects in the Solar System. (October 2022)Back then, the Solar System had nine planets, assorted moons, and asteroids. Plus, of course, the sun.

Now we've got planets, dwarf planets, minor planets, natural satellites, trans-Neptunian objects, plutoids, comets, centaurs, and small Solar System bodies.

Just to keep things interesting, definitions for the new labels overlap. Some labels, like plutoids, didn't catch on; and it all keeps changing as we collect more data.

This week I'll be talking about sednoids, another subset of trans-Neptunian object;1 along with whatever else comes to mind.

More at A Catholic Citizen in America.

(Sednoids: trans-Neptunian objects whose orbits may hold a clue to the fate of Planet X. Also comets, the Kuiper belt, and a 1910 apocalypse that fizzled.)

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