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Es11

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Es11

  1. 1. The Birth and Death of Stars
  2. 2. Objective <ul><li>Describe the life cycle of a star </li></ul><ul><li>Interpret a Hertzsprung-Russell diagram </li></ul>
  3. 6. Main sequence star <ul><li>Protostar : formed from dust and gas. Why? Gravity. </li></ul><ul><li>Compression -> heat . </li></ul><ul><li>Heat -> hydrogen fusion </li></ul>
  4. 8. Red giant star
  5. 9. Red giant <ul><li>Star runs out of H, begins to swell. </li></ul>
  6. 10. A dying star can… <ul><li>1. Cool into a dwarf star (white, then black) </li></ul><ul><li>OR </li></ul><ul><li>2. If it’s big, explode in a supernova. </li></ul><ul><li>(fusion, contraction & expansion, form heavier elements, then supernova) </li></ul>
  7. 12. Neutron Star <ul><li>Supernova throws gas and dust into space. Dense core left = neutron star. </li></ul><ul><li>If big enough, becomes black hole. </li></ul>

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