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star cycle
Updated: 10/8/2020
star cycle
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Storyboard Text

  • Ok class today we will learn about a high-mass stars life cycle
  • High-mass stars like low mass stars are formed inside of a nebula
  • nebula
  • Over time, the hydrogen gas in the nebula is pulled together by gravity and it begins to spin.As it gets faster it becomes a protostar.
  • The temperature eventually will reach 15,000,000 degrees and nuclear fusion occurs and a main sequence star is formed.
  • As the star glows, hydrogen is converted into helium.Once this happens the star is no longer making heat by nuclear fusion and the star will become unstable.The star will cool,expand ,and turn red that when the star becomes a red giant.
  • Once stars that are 5 times or more massive than our Sun reach the red giant phase, their core temperature increases as carbon atoms are formed from the fusion of helium atoms.
  • The repulsive force between the nuclei overcomes the force of gravity, and the core recoils out from the heart of the star in a shock wave, which we see as a supernova explosion.
  • Gravity continues to pull carbon atoms together as the temperature increases and additional fusion processes proceed, forming oxygen, nitrogen, and eventually iron
  • The shock wave propels this material out into space. The material that is exploded away from the star is now known as a supernova remnant.
  • After that the remains of the star becomes either a neutron star or a black hole.
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