Stage and oxygen. As the star begins to fuse

Stage 1Stars forms in a high density region of Nebula (Orion Nebulae) and scattered throughoutmost galaxies.

Stars are born when a group of cloudsand dust (Cepheus B) begin tocollapse under its own gravity. Stage 2As the cloud collapse, the materials at the centre begins to heatup and the particles (clouds and dust) start to fuse together which are theenergy source of the stars. Therefore, the star starts to shine forming Protostars. Protostar is the hot coreat the heart of the collapsing cloud that will become a star. The centraltemperature of a protostar are able to reach 15 million degree Celcius when itscontain enough matter.Stage 3During the hightemperature, hydrogen atoms of new born star fuses together to form helium(diffusion) which creates energy that powers the star.

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 Stage 4The stars starts torelease energy, preventing the star from collapsing and causes it to shine,becoming a Main Sequence Star suchas Sun.Stage 5The solar mass of a star remains the same in main sequence forabout 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 ofthe collapse to adulthood. Our Sun will stays in mature phase for about 10billion years.Stage 6The helium corebegins to collapse further and the star become denser and hotter.Stage 7When helium core ishot enough, the helium begins to form carbon and oxygen.

As the star begins tofuse helium, it creates more energy, causing the outer layer of the stars toexpand. One day, our Sun will grow very large that will swallow up all theplanet of the solar system and it will become a Red Giant.Stage 8The helium core weaken,and the outer layer of the star gets further from the middle and force of the gravitywill getting weaker, causes the outer layers leaving away from the core and expandout to become a Planetary Nebula(the most beautiful objects in the universe).Stage 9The remaining corebecomes a White Dwarf which is onlyabout the size of the Earth that is incredibly dense and hot.

After millions ofyears, it will cool down and become a BlackDwarf.