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US to build new nuclear gravity bomb
(www.defensenews.com)
This is a most excellent place for technology news and articles.
You dont just "take over" an inertial guidance system.
No, but the possibility exists.
In the same way the atoms that make up you and the atoms that make up a car wont hit eachother if you get hit. Unless there is some massive amount of fuckery theres no stopping a bomb once its dropped.