I couldn't find an compatible heading for this question and decided to place it here since it deals with nuclear engineering, sort of. From the documentary movie, Trinity and Beyond, which is a history of the American nuclear weapons program, it seems that high atmosphere nuclear detonations were tested for anti missile and anti-bomber defence. Incoming missiles from the Soviet Union would be destroyed in transit by high altitude thermo-nuclear blasts. As soon as the enemy missiles were detected, nuclear tipped missiles would be launched to destroy them Does this technology work? Why wouldn't one use it instead of Star Wars technology? Also it seems that testing was done to created a radioactive debris shield in space that would disable incoming missiles. Why wouldn't this work?