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submitted 3 months ago by randomaccount43543@lemmy.world to c/xkcd@lemmy.world

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Alt text:

Astronomers are a little unsure of the applicability of this index, but NASA's Planetary Protection Officer is all in favor.

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[–] mcmoor@bookwormstory.social 13 points 3 months ago (9 children)

Is our moon really that big? I thought Charon-Pluto is kinda a special cases that they look like twin planets instead

[–] Gordon@lemmy.world 1 points 3 months ago

That's exactly what I was thinking, how is it possible?

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