How did #Tsar bomba - largest #nuclear weapon ever tested - contribute to 1963 Partial Test-Ban treaty http://www.bbc.com/future/story/20170816-the-monster-atomic-bomb-that-was-too-big-to-use …
and the US maintained a secret "backup" plan to test very-high yield weapons in outer space should Soviets violate PTBT through 1970s.
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What kind of test did they consider as "very high yield"?
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