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Message: <blockquote data-quote="Umbran" data-source="post: 1261842" data-attributes="member: 177">A large amount of the damage done by nuclear weapons on Earth happens because the weapon goes off in an atmosphere.  The atmosphere abosorbs energy released, and then the shockwave and super-heated gases do the nasty work for you.Set one off in a vacuum, and what do you get?  Lots of radiation, and the mass of the missile vaporized and accelerated (so that it looks rather much like alpha radiation, actually).  If, as they claim, the hull doesn't absorb much of the radiation, not much damage is done.</blockquote>