"Planet X" was used before Pluto was discovered. The X didn't mean 10. In fact, ... | Hacker News

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		globular-toast 10 months ago \| parent \| context \| favorite \| on: Is Planet Nine Alone in the Outer System? "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.

yellowapple 10 months ago [–]

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

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