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 == Stopped in mid-air? == 

 :A smaller ice cube will be stopped in mid-air and explode. An ice cube with a diameter of 50 m or more, however, may also be stopped in mid-air, as long as it comes in at a very low angle and thus has to pierce through a lot of atmosphere. 

 How can it be ""stopped in mid-air""? Surely it's still moving before it explodes!"