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What is the source of energy of this sun and other stars?
The source of energy of this sun and other stars is nuclear fusion reactions of hydrogen. The net process is the fusion of four Hydrogen nuclei to make one helium nucleus plus some energy. The balance between gravity compression and outward thermal pressure controls the rate of the nuclear fusion reactions.
The following questions are about the nuclear reactor of a power plant.
a) Which isotope of uranium produces the energy in the fuel rods?
b) Will the fuel rods last forever?
c) Is the energy produced by nuclear fission or nuclear fusion?
d) What is the purpose of using the graphite moderator ?
e) What is the function of boron rods in the nuclear reactor?
f) Why is liquid sodium (or carbon dioxide gas) pumped through the reactor?