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The Plutonium used by NASA is Pu-238, which is quite different from the weapons usable Pu-239. Pu-238 would melt its self to a liquid by its own alpha decay heat before long before you get a critical mass, thus Pu-238 is not weapons usable.
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The Plutonium used by NASA is Pu-238, which is quite different from the weapons usable Pu-239. Pu-238 would melt its self to a liquid by its own alpha decay heat before long before you get a critical mass, thus Pu-238 is not weapons usable.