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Planet X in Japanese

Planet X in Japanese is 惑星X.

Planet X in Japanese

惑星X
proper noun
(astronomy) A hypothetical planet in the Solar system, beyond the currently known outermost planet. (The term was applied to Eris for a short while, when Pluto was still considered the ninth planet.)
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What is "Planet X" in Japanese?

"Planet X" in Japanese is 惑星X.

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Translations from WikDict, CC BY-SA · example sentences from Tatoeba, CC BY 2.0 FR.