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1. At what temperature do stars begin the process of
nuclear fusion?

User Vrybas
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Answer:Once the temperature reaches 15,000,000 degrees Celsius, nuclear fusion takes place in the center, or core, of the cloud. The tremendous heat given off by the nuclear fusion process causes the gas to glow creating a protostar. This is the first step in the evolution of a star

Step-by-step explanation:

User Doua Beri
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