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25 3

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Transcript

  • 1. 25.3 The Universe
  • 2. Vocabulary
  • 3. Galaxy
    A group of stars, dust, and gases held together by gravity.
  • 4. Galaxy Cluster
    A system of galaxies containing from several to thousands of member galaxies.
  • 5. Hubble’s Law
    A law that states that the galaxies are retreating from the Milky Way at a speed that is proportional to their distance.
  • 6. Big Bang Theory
    The theory that proposes that the universe originated as a single mass, which subsequently exploded.
  • 7. Key Concepts
  • 8. The Milky Way is a large spiral whose disk is about 100,000 light-years wide and about 10,000 light-years thick at the nucleus.
  • 9. In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars.
  • 10. The red shifts of distant galaxies that the universe is expanding.
  • 11. The big bang theory states that at one time, the entire universe was confined to a dense, hot, supermasentire ball. Then about 13.7 billion years ago, a violent explosion occurred, hurling this material in all directions.