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Worldbuilding

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    $\begingroup$ Quibble: collision force doesn't "trigger" a nuclear explosion the way it can for many conventional explosives. Nuclear explosions are what happens when one assembles a big enough pile of fissionables (give or take some neutron moderators/reflectors), and will cheerfully go off without so much as a nudge. The trick is assembling that big enough pile, because small explosions keep scattering your pile before you can get enough together for a truly impressive boom. Gun and implosion types are both methods to to "assemble" very quickly; the collision force is a largely irrelevant side effect. $\endgroup$
    – Jay McEh
    Commented Jul 5 at 14:50
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    $\begingroup$ True, thanks. Wasn't really certain how to explain that in a good (and fully accurate) manner, so I sort of skipped over it. $\endgroup$
    – kenod
    Commented Jul 5 at 14:52
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    $\begingroup$ Fun fact: gun-type bombs are so easy to build that they didn't even bother to test the Little Boy design before dropping it. $\endgroup$
    – thegreatemu
    Commented Jul 5 at 22:44