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Astronomy Intro


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Astronomy Intro

  1. 1. Astronomy To Infinity and Beyond!
  2. 2. What’s in the Universe? Everything – All matter and energy that exists now, in the past and in the future
  3. 3. Is Every Light in the Sky a Star? Every spot of light here is another galaxy!
  4. 4. Andromeda Galaxy What’s in a galaxy?
  5. 5. Nebula
  6. 6. How Far is Far? <ul><li>Too far to measure with meters or kilometers </li></ul><ul><li>How about a light-year? </li></ul><ul><li>Nearest galaxy is _______ light-years away </li></ul>160,000 <ul><li>What we see happened </li></ul><ul><li>in the past </li></ul>
  7. 7. How Did it All Begin? <ul><li>How old is the universe? </li></ul><ul><li>What was there before the universe was created? </li></ul><ul><li>What is the evidence? </li></ul>
  8. 8. Edwin Hubble <ul><li>Measured movement of galaxies </li></ul><ul><li>Found that all galaxies were moving away from each other </li></ul><ul><li>VERY unexpected </li></ul><ul><li>Galaxies farther away moving faster </li></ul>
  9. 9. Big Bang Theory <ul><ul><li>The dominant scientific theory of the origin of the universe. </li></ul></ul>
  10. 10. Big Bang – The Theory <ul><li>The universe was once extremely dense </li></ul><ul><li>A cosmic explosion occurred ~ 13-15 billion years ago </li></ul><ul><li>Right after the explosion matter in the universe was very hot and dense </li></ul><ul><li>The universe has been expanding and cooling since then </li></ul>
  11. 11. What Happened Next? <ul><li>At first, the universe was so hot and dense that matter was very different </li></ul><ul><li>Temperatures exceeded billions of degrees </li></ul><ul><li>As the universe expanded and cooled, particles that make up atoms, like quarks and electrons , formed </li></ul>
  12. 12. Cosmic Background Radiation <ul><li>In 1965 dim radiation was found coming from apparently empty parts of the universe </li></ul><ul><li>Like long-lasting embers from a fire </li></ul>
  13. 14. Other Theories <ul><li>Cycles of expansion & contraction </li></ul><ul><li>Steady State </li></ul>
  14. 15. How Old? <ul><li>Calculate backwards using velocities of galaxies </li></ul><ul><li>13-15 billion years </li></ul>
  15. 16. What Happens Next? There are possibilities…. <ul><li>If the amount of matter in the universe is enough…… </li></ul><ul><li>If not …………… </li></ul>