Thursday, 1 February 2018

Why does the Sun's (or other stars') nuclear reaction not use up all its "fuel" immediately?


The temperature and pressure everywhere inside the Sun reach the critical point to start nuclear reactions - there is no reason for it to take such a long time to complete the reaction process.


Just like a nuclear bomb will complete all the reaction within $10^{-6}$seconds.


Why does most of the hydrogen of the Sun still not react even though it reaches the critical point, and why take stars billions of years to run out of fuel?




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