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Episode 9: Hans Bethe

Play Nov 10•4:15

Everyone asks whether the Sun is shining. Hans Bethe asked why it was shining. Bethe, who died in March 2005 at age 98, was the first to explain how the Sun generates energy to shine. In the 1920s, when Bethe was first studying physics, scientists knew that the Sun could release energy by contracting gravitationally. But such shrinking does not produce enough energy to account for the Su...

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