1. Why does helium fusion require a higher temperature than hydrogen fusion? 2. How can the… 1 answer below »

1. Why does helium fusion require a higher temperature than hydrogen fusion? 2. How can the contraction of an inert helium core trigger the ignition of a hydrogen-fusion shell? 3. Why does the expansion of a star’s envelope make it cooler and more luminous? 4. Why is degenerate matter so difficult to compress?  

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