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A recent news article states that a plasma's temperature, for self-sustaining fusion, needs to be around 100 million C - but the core of the Sun is only around 15 million C. Why does a plasma's temperature need to be so high for fusion to work? And why not for the Sun?

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A recent news article states that a plasma's temperature, for self-sustaining fusion, needs to be around 100 million C - but the core of the Sun is only around 15 million C. Why does a plasma's temperature need to be so high for fusion to work? And why not for the Sun?	27