They are tiny compared to the earth. I can hardly imagine they even wipe out lives within 1000km radiused area, which still is a tiny compared to the earths surface size. Asteroids are, just giant rocks right? not atomic bombs, wich gives an increasing explosion due to it’s chain reaction. So why?
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They are travelling really, really, really fast. The faster something is moving, the more momentum it has, and the more destructive the impact.
Think of bullets.
Some bullets make bigger holes because there is more explosive power in the shell. The bigger bullets are bigger because they pack more gun powder. They make bigger holes for the same reason. It’s not the size of the slug that does all that damage alone, it’s also the explosive power behind it.
Planet Killers are either massive enough **or** going fast enough to earn their name. Scientists are referring to either of these factors when applying the label
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