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			I was in a Naval ROTC in HS and we had a chance to go on a Ballistic missile nuclear sub (SSBN).  Each sub carries 12 missiles and each missile has 8 warheads, i believe, each capable of 10 times the power of Hiroshima.  They work by shooting into the atmosphere and than breaking apart and they can direct each of the 8 warheads where to go with laser precision.  So shooting into space isn't that far fetched.
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