Life Cycle Of A Star

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Life Cycle Of A Star

  1. 1. Life Cycle of a Star Waves, Atoms and Space
  2. 2. Stage 1 Protostars
  3. 4. Protostars <ul><li>Huge clouds of gas (hydrogen) in which stars are made. </li></ul><ul><li>Many thousands of times bigger than our solar system </li></ul><ul><li>As the clouds collapse stars are born in them </li></ul>
  4. 6. Stage 2 Main sequence star
  5. 9. Main Sequence Star <ul><li>E.g. Our sun </li></ul><ul><li>Sequence lasts for about 10 000 million years </li></ul><ul><li>Our sun is about half way through it’s main sequence </li></ul>
  6. 11. Stage 3 Red Giant
  7. 14. Red Giant <ul><li>As the sun runs out of hydrogen the outer layers of the sun will become cooler </li></ul><ul><li>They will also expand massively. </li></ul><ul><li>The Earth (along with Mercury, Venus and Mars) will be swallowed up. </li></ul>
  8. 15. Stage 4 White Dwarf
  9. 18. White Dwarf <ul><li>Gravity will cause the red giant to collapse </li></ul><ul><li>The sun is now much cooler and it collapses into a small white star </li></ul><ul><li>It still has the same mass as the original sun! </li></ul>
  10. 20. Stage 5 Black Dwarf
  11. 24. Black Dwarf <ul><li>The sun cools more and more </li></ul><ul><li>Eventually it will become a black mass emitting no light </li></ul><ul><li>It will then spend the rest of eternity drifting silently through space </li></ul>
  12. 25. Stars bigger than our sun! At least four times bigger (you don’t need to know about these for your exams)
  13. 26. Stage 4 (for a big star) Red Supergiant
  14. 30. Stage 5 (for a big star) Supernova
  15. 32. Supernova! <ul><li>The largest and most powerful explosions in the universe. </li></ul><ul><li>The red supergiants literally blow themselves apart! </li></ul>
  16. 34. Supernova <ul><li>All the atoms we are made from came originally from these giant supernova explosions. </li></ul>
  17. 36. Stage 6 (for a big star) Black hole
  18. 39. Black hole <ul><li>After the supernova a huge mass is left behind. </li></ul><ul><li>There is so much mass its gravity prevents even light from leaving it </li></ul><ul><li>Black holes can suck in nearby stars and solar systems. </li></ul>
  19. 40. <ul><li>Luckily there are no black holes any where near our sun! </li></ul>

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