Stage and oxygen. As the star begins to fuse

Stage 1

Stars forms in a high density region of Nebula (Orion Nebulae) and scattered throughout
most galaxies. Stars are born when a group of clouds
and dust (Cepheus B) begin to
collapse under its own gravity. Stage 2

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As the cloud collapse, the materials at the centre begins to heat
up and the particles (clouds and dust) start to fuse together which are the
energy source of the stars. Therefore, the star starts to shine forming Protostars. Protostar is the hot core
at the heart of the collapsing cloud that will become a star. The central
temperature of a protostar are able to reach 15 million degree Celcius when its
contain enough matter.Stage 3During the high
temperature, hydrogen atoms of new born star fuses together to form helium
(diffusion) which creates energy that powers the star. Stage 4

The stars starts to
release energy, preventing the star from collapsing and causes it to shine,
becoming a Main Sequence Star such
as Sun.Stage 5

The solar mass of a star remains the same in main sequence for
about 10 billion years, until all of the hydrogen has been used up and fused together,
forming helium about 50 million years and became mature from the beginning of
the collapse to adulthood. Our Sun will stays in mature phase for about 10
billion years.Stage 6The helium core
begins to collapse further and the star become denser and hotter.Stage 7

When helium core is
hot enough, the helium begins to form carbon and oxygen. As the star begins to
fuse helium, it creates more energy, causing the outer layer of the stars to
expand. One day, our Sun will grow very large that will swallow up all the
planet of the solar system and it will become a Red Giant.Stage 8

The helium core weaken,
and the outer layer of the star gets further from the middle and force of the gravity
will getting weaker, causes the outer layers leaving away from the core and expand
out to become a Planetary Nebula
(the most beautiful objects in the universe).Stage 9

The remaining core
becomes a White Dwarf which is only
about the size of the Earth that is incredibly dense and hot. After millions of
years, it will cool down and become a Black
Dwarf.