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Where does the Sun get its fuel?

The Sun runs on hydrogen, which is what it is made of - it is very gradually consuming itself! Because the fusion reactions it uses create so much energy, the Sun will continue to shine for a long time - probably another 5 billion years. The fusion (converting hydrogen into helium) occurs only in the very deepest part of the Sun, which is extremely hot (millions of degrees), and this heat gradually filters out to the outer layers which are only a few thousand degrees, and this heat is then radiated into space as light.

A Smith

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