NASA’s asteroid collision: how many asteroids are really out there?
More or Less: Behind the Stats
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Are Asteroids a Threat to the Earth?
Nassa's Steve Chesley is a senior research scientist at nassa's jet propulsion laboratory. His job is to make sure we avoid an imagetin style surprise asteroid. Larger asteroids are, for our good luck, the ones that are easiest to find because they're the ones that do the most damage. But how worried should we actually be about asteroids? Time to speak to him!
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