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: http://star.arm.ac.uk/~jgd/energy.html
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The Sun is our nearest star at a distance about eight
light minutes. It is not much compared to the four-light-year distance
of the second nearest star, Proxima Centauri. The Sun was born about five
billion years ago and will continue to shine for another five billion years
before it will turn into a red giant. Its energy
is created in a fusion reaction of hydrogen atoms into helium.
An overview of the Sun's parts.
The three major interior zones
are the core (the innermost part of the Sun where energy is generated by
nuclear reactions), the radiative zone (where energy travels outward by
radiation through about 70% of the Sun), and the convection zone (in which
convection currents circulate the Sun's energy to the surface).
The Sun converts 600 million tons
of hydrogen into 596 million tons of helium every second .. the rest goes
into energy.