Asked by: Edward Seymour, Hove

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The Sun is powered by the energy released when the nuclei of its hydrogen atoms slam together so hard they fuse together. As these nuclei are protons with the same positive charge, they repel each other, so it takes incredibly high temperatures in excess of around 15,000,000°C to persuade them to fuse together. But such conditions exist only in the Sun’s intensely hot, dense core, which makes up barely 1 per cent of its total volume.


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Authors

Robert is a science writer and visiting professor of science at Aston University.

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