International Environmental law and Nuclear Winter

Nearly thirty years after its introduction in the 1980s, the Nuclear Winter hypothesis has gained additional quantitative confirmation, providing a robust argument for the illegality of nuclear weapons under the Law of Armed Conflict.
Like our own world history, the Universe had its own cycle of events.    After the initial Big Bang (though 'Bang' is a confusing word, it may have been rather dull), there were no light sources in the Universe.