an asteroid. the goal is to prevent armageddon. >> reporter: big cheers at the johns hopkin civic laboratory where i am right now. they were responsible for building spacecraft when it hit the target on monday night. this spacecraft has been traveling in space at about 14,000 miles an hour, 4 miles per second in the vastness of out in space. the spacecraft not that big. is it about the size of a vending machine. so is it an incredible feat that nasa was able to accomplish. was nasa able to successfully push that asteroid just a little bit off the current trajectory. the reason that is so

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