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submitted 8 months ago by randomaccount43543@lemmy.world to c/xkcd@lemmy.world

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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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[–] Frozengyro@lemmy.world 1 points 7 months ago

I've heard that in feet they originally measured it to 29000 exactly. But they added 2 feet so people didn't think they were estimating the height.