The sun is using up its fuel supply at an increasing rate, will gradually get hotter during the next ten billion years. By that time the earth's surface temperature will be lifted to about 750° Fahrenheit, hot enough to boil away the oceans, char organic matter, and melt tin, lead and zinc. Then the last of the sun's hydrogen atoms will be converted into helium. With no more fuel on hand, the sun will cool and fade.
Cornell's brilliant, Alsatian-born astrophysicist Hans Albrecht Bethe thus elaborated his already famed theory of the source of stellar...
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