The core of a star must reach a temperature of _____ degrees Celsius for hydrogen fusion to begin. A.10,000 B.100,000 C.1,000,000 D.10,000,000 E.100,000,000
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D.10,000,000. [ When the core temperature reaches about 10 million kelvin, this will initiate the proton-proton chain reaction allowing hydrogen to fuse into helium.
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