/u/nukemod's posts
Would a large-scale nuclear exchange like that which could have occurred between the United States and Soviet Union cause a mass extinction of similar intensity to that at the end of the Cretaceous? Or would it be more or less severe, or would there be no mass extinction at all?
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If the Milky Way-Andromeda collision were to occur now rather than in several billion years, what effects could we observe on earth?
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