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  • Hi there! I will be explaining the life cycle of a star. Let's go on a trip to our solar system.
  • Stars start out as a main sequence. Its composition is > 98% hydrogen and helium. 1/3 of the hydrogen is converted to helium.
  • Main Sequence
  • As hydrogen expands in their cores, these stars extend their outer layers and can grow over 100 times their main sequence size. In this stage, the star is called a red giant.
  • Red Giant
  • Next, the outer layers of gas are ejected while the star's core contracts into a white dwarf. This is called a planetary nebula.
  • Planetary Nebula
  • The next stage of a star is the white dwarf. This star core is usually made of carbon and oxygen. It can also have neon, magnesium and helium.
  • White Dwarf
  • Lastly and hypothetically, a star turns into a black dwarf. The Universe's existence is too short to determine its existence but there is a possibility that it exists. Thank you for coming on this journey with me to learn about stars. I hope you enjoyed!
  • Black Dwarf
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