Ten asteroid encounters that almost got us (and still could)
If your corner of the Earth were about to be hit by a relatively large asteroid - say the size of a large city - you wouldn't know it until a second before impact. At that point, you and everything around you would crinkle and vapourize, like plastic wrap in a fire.
The ultra-supersonic ball of rock and ore would do this without touching you by superheating the air in front of it as it races to its final destination.

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