The sun is a star shining from 4.5 billion years, it made up 96% to 4% of hydrogen and hydrogen, with some small percentage of carbon, oxygen, iron ecc.Le stars like the sun form a planetary nebula, that because of a shock wave caused by a star esplosa.L 'shock wave compresses the gas of the nebula, so much that he does condense to form a globule bock, which is a star was born, but they do not shine before a few hundred million years, because the energy released by the star born in the form of photons will take many millions of years before crossing the convection zone and radiative della stella.
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