Astronomy

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Slide show about astronomy.

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Astronomy

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

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