Evolution of a star 26 3

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Evolution of a star 26 3

  1. 1. Evolution of a Star 26-3 How Stars Form Adult Stars Death of Stars
  2. 2. How Stars Form <ul><li>All stars get started in dense region of gravity in a Nebula </li></ul><ul><li>Nebula = Dust and Gases </li></ul><ul><li>Heat up and contracts making a Protostar when there is enough Mass  Then nuclear Fusion starts </li></ul>
  3. 3. Adult Star <ul><li>90% of time will be a Main Sequence star </li></ul><ul><li>H  He at a stable rate </li></ul><ul><li>Star mass will determine place in Main Sequence </li></ul><ul><li>Sun will be MS for 10 billion years </li></ul>
  4. 4. Adult Stars / Low Mass Star <ul><li>Small nebula make small cool stars that live long </li></ul><ul><li>Low energy production = Red stars—coolest—least bright </li></ul><ul><li>Red-MS-star = 3500k may stay a MS for more than 100 billion years </li></ul><ul><li>Low Mass Stars  White Dwarf </li></ul>
  5. 5. Fate of Low Mass Star <ul><li>White Dwarf = Growing core with mass all gone — if continues to cool will become a </li></ul><ul><li>Black Dwarf </li></ul>White Dwarf Black Dwarf
  6. 6. High Mass Star <ul><li>Go from H-fusion to other elements such as He </li></ul><ul><li>Supernova = Explosion—makes enough energy to make other elements </li></ul><ul><li>Neutron Star– Dense remnant of High-mass star </li></ul>
  7. 7. High Mass Star <ul><li>Pulsar = Neutron star giving off Radio waves </li></ul><ul><li>Black Hole = is an object who's surface gravity is so great light cannot escape </li></ul>

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