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The sun is made out of gas - mostly hydrogen gas. This gas is compressed into a ball (the sun is a huge 'ball' of gas) by the immense pull of the sun's gravity pulling it towards the centre of the sun. As the gas was compressed when the sun formed millions of years ago, it heated up to such an extent that the hydrogen atoms squashed together so much that they formed larger atoms - mostly of helium. Every four hydrogen atoms would squash into a larger helium atom. This results in a large amount of heat energy being released which makes the sun shine. The correct name for this process is 'thermonuclear fusion'.
no the sun is nuclear like all stars that is how we get light by nuclear reactions

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