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27 April, 22:31

Explain how we know that the Sun's energy is not supplied either by chemical burning, as in fires here on Earth, or by gravitational contraction (shrinking).

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  1. 27 April, 22:55
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    The vast amount of energy produced by the Sun over the past 4.5 billion years exceeds the amount that could be supplied by burning or shrinking of the Sun by a significant factor. Chemical burning would only last a few thousand years, whereas gravitational contraction would provide energy for only about a hundred million years. but we can confidently say the sun gets its energy from matter that is converted into energy through the fusion of hydrogen into helium.
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