Scientists and astronomers and such have mapped 95% of "near-Earth objects" like asteroids and meteors which, if they hit Earth, would have civilization-ending consequences.
BUT, they have mapped LESS THAN ONE PERCENT of objects like the one that hit in Russia recently which would completely devastate a city. A meteorite like that could hit us RIGHT NOW and we would have no clue it was coming! This statistic blew my mind and I am so glad I didn't read it before the Mayan end of the world last December, because I would have never, ever, slept. Ever.
So, that's why we need NASA and stuff.
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