The Life of Star Essay

481 WordsMar 12, 20152 Pages
Protostellar evolution is the next stage of the star. The star’s gas has been completely ionized, but its protons do not have enough thermal energy in order to star nuclear fusion. These events proceed slowly as the protostar approaches its next phase into the main sequence. The evolution slows because of the increased heat as a result. As the protostar’s luminosity decreases, so does its contraction rate. The protostar is now approaching its birth as a result from its increased heat. A newborn star is born as a result from its earlier evolution. After ten million years of its life, the protostar finally becomes a star. This is because the contraction raised the central temperature to ten million Kelvin, which was enough to ignite nuclear fusion. The protons in the star begin fusing into helium nuclei in the core. Now, the star’s lower temperature means that the luminosity is less than the solar value after newly forming. Finally, the newborn star is a result of the ignition of nuclear fusion. A main sequence star is the next stage of a star’s life. There is a balance between pressure and gravity now that the star mostly lives its life as a main sequence. The rate of nuclear energy being generated currently matches the rate where energy is radiated from the surface. These evolutionary events occur over the time of forty to fifty million years. After the main sequence star begins fusing hydrogen, it burns steadily for a very long time. Ultimately, the main sequence star is now in the middle stages of its life. After a main sequence star forms, it starts to die, resulting in the death of a star. The star’s last stages depend on its mass. A low mass star would die start to die as a red giant, then a planetary nebula, to a white dwarf. A high mass star would start to die from a supernova, causing it to become either a neutron star or a black hole. A low mass

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