Life Cycles of Stars

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  • Created by: ejones2
  • Created on: 12-03-14 17:08
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  • Life Cycles of Stars
    • stars are made from clouds of dust and gas in space
      • gravity pulls the dust and gas together so it gets hot and NUCLEAR FUSION BEGINS
        • in NUCLEAR FUSION hydrogen nuclei join and release energy
          • this makes the star VERY HOT
    • In the STABLE PHASE of the life cycle...
      • the force of GRAVITY holding the star together is BALANCED
        • with the outward pressure of NUCLEAR REACTIONS
    • when all of the HYDROGEN has been used up...
      • LARGER NUCLEI begin to form and the star expands to a RED GIANT
        • THEN...
          • Either the STAR CONTRACTS UNDER THE PULL OF GRAVITY (like the SUN)
            • this forms a WHITE DWARF which fades and CHANGES COLOUR AS IT COOLS
          • Or  a larger star with more mass goes on making nuclear reactions
            • this gets HOTTER and EXPANDS until it explodes as a SUPERNOVA
              • an EXPANDING SUPERNOVA throws hot gas into space leaving a NEUTRON STAR
                • this could shrink further and become a BLACK HOLE which has really strong GRAVITY
    • STARS ABOUT THE SAME SIZE AS OUR SUN...
      • MAIN SEQUENCE STAR
        • RED GIANT
          • WHITE DWARF
            • BLACK DWARF
    • STARS BIGGER THAN THE SUN...
      • MAIN SEQUENCE STAR
        • RED SUPER GIANT
          • SUPERNOVA
            • NEUTRON STAR
            • BLACK HOLE
  • the force of GRAVITY holding the star together is BALANCED
    • with the outward pressure of NUCLEAR REACTIONS
  • BLACK HOLE

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