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I need some help with fusion reactors in space. What position did Eddington take as opposes to the Kelvin-Helmholz hypothesis?
I don't know the answer to this. The classic story is that Lord Kelvin had calculated the age of the Solar System under the assumption that the Sun was producing energy by continued gravitational contraction. The answer that he came up with was very short--a few million years or less. We know from radiometric age dating of meteorites, however, that the true age of the Solar System is 4.55 billion years. The resolution to this "paradox" is that the Sun is producing energy by nuclear fusion, not by gravitational contraction. Prof. James Kasting (Penn State Astrobiology Research Center)
February 15, 2002
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