Such events will be more severe than the nuclear winter that became such an issue during the Cold War (The Threat 1-4). ... When a star has burned off about 10 to 20 percent of its hydrogen, its core will start to run out of fuel and begin the last stages of its life (The Fading 1). ... These elements will collect in the center of the star as the red giant sheds most of its envelope. As it sheds it will create a planetary nebula and then emerge as a hot white dwarf star (The Fate 1). Once a white dwarf star forms, its structural and thermal evolution is dominated by cooling down. ...

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