NASA’s asteroid collision: how many asteroids are really out there?
More or Less: Behind the Stats
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Asteroid Diversion
We've only located forty per cent of asteroids that pose a threat. To divert an asteroid you need to know where it is, the biggest ones. A 150 meter wide space rock about 500 feet could obliterate a whole city. The chances of that kind of thing happening are tiny. Much more likely we would have decades warning that a large asteroid was heading our way.
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