The Life Cycle Of A Star

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Protostars

  • Stars form from massive clouds of dust and gas
  • Gravity pulls the dust and gas together
  • As the mass pulls together it gets hot - a star is formed when it is hot enough for the hydrogen nuclei to fuse together to make helium
  • The fusion process releases energy which keeps the core of the star hot
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Stars About The Same Size As The Sun

Please (protostar)
May (main sequence star)
Sharon
Stevens
Ring (red giant star)
Gary
Simpson
Whilst (white dwarf)
Destorying
Black (black dwarf)
Dalmations

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Main Sequence Stars

  • During this stable phase the force of gravity holding the star together is balanced by high pressures, due to the high temperature
  • Our sun is at this stage
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Red Giant Stars

When all the hydrogen has been used up in the fusion process, larger nuclei begin to form and the star may expand

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White Dwarf Stars

  • When all the nuclear reactions are over the star will contract (become smaller)
  • It fades
  • It cools
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Black Dwarf Stars

  • Continues to cool
  • Continues to lose its brightness
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Stars Much Bigger Than The Sun

Please (protostar)
May (main sequence star)
Sharon
Stevens be
Relieved, (red super giant star)
She's
Grumpily
Stuck 
Serving (supernova)
Nice (neutron star)
Sandwhiches
or 
Big (black hole)
Hotdogs

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Red Super Giant Stars

  • Stars swell up to many times their former size
  • This stage can last up to ten thousand years
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Supernovas

  • Larger stars with more mass will go on making nuclear reactions, getting hotter
  • Expands until it explodes
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Neutron Stars

  • Depends on the mass of the supernova as to whether this is formed
  • Smallest type of star
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Black Holes

Depends on the mass of the supernova as to whether this is formed

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