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How does the amount of hydrogen in a star change?
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How does the amount of hydrogen in a star change?

User Bigsby
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Explanation: The collisions which occur between the hydrogen atoms starts to heat the gas in the cloud. ... As it glows, hydrogen is converted into helium in the core by nuclear fusion. The core starts to become unstable and it starts to contract. The outer shell of the star, which is still mostly hydrogen, starts to expand.

User Narcy
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