A star begins its life as a large and comparatively cool mass of gas. The contraction of this gas and the subsequent rise of temperature continues until the inside temperature of the star reaches about 1,000,000° C. The atoms move faster and that is what causes the star to gain its heat and for the temperature to rise. At this point a nuclear reaction takes place in which the nuclei of hydrogen atoms combine with heavy hydrogen deuterons form the nucleus of the inert gas helium. The later reaction frees large amounts of nuclear energy, and the further contraction of the star probably has stopped. When the release
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