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there are three stages in the
evolution of a typical sun like star. First is protester stage, main sequence
stage, and third is red giant stage.  This
idea will tell us that how a star is born, ages, and dies. Life spans that
exceed billions of years for most stars. Studying stellar evolution we can find
out stars of different ages, at different points in their life cycles. Every
stage of a star’s life is ruled by gravity. A stare is a ball of very hot
gases, caught between the opposing forces of gravity.

 Protostar stage:  at the first stage gravitational contraction
continues much and more. This causes to the developing star  to heat much faster than its outer envelope. When
the temperature reaches of 10 million K, the pressure within intense that
groups of a several step process and fuse into single helium nuclei. Now
astronomers refer to this nuclear reaction and hydrogen nuclei are fused into
helium. The heat causes the gases inside stars to move with increased vigor,
raising the internal gas pressure. Outward force that balances the inward force
of gravity. Then reaching this balance, the stars become stable main sequence

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Main – Sequence stage: in
this stage the stars minimal changes in size or energy output. Into helium we
can get Hydrogen and the energy released maintains the gas pressure high to
prevent gravitational collapse. At the ending of their main sequence stage hot,
blue stars got energy and they substantially deplete their hydrogen fuel in
only a few million years.  The red stars
may take hundreds of billions of years to burn their hydrogen. A yellow star
like the sun takes 10 billion years. An average star spends 90 percent of its
life burning hydrogen.  Once hydrogen
comes out of stars they die. With the least massive stars they die late when
another type of nuclear reaction is triggered and the star becomes a red giant.

Red Giant Stage: When
hydrogen is consumed in star’s interior the red giant stage begins leaving a
helium rich core. Star’s outer shell hydrogen fusion is still progressing, in
the core there is no fusion taking place. The core no longer has the gas
pressure to support it self against the inward force of gravity without a
source of energy. Now the core begins to contract. As gravitational energy is
converted into thermal energy, The collapse of a star’s interior causes its
temperature to rise rapidly . In the shell a more vigorous level of hydrogen
fusion surrounding the star’s core. From accelerated rate of hydrogen fusion
expands the star’s outer gaseous shell using the additional heat. Sun like
stars become bloated red giants. 

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