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  1. 1. 25.3 The Universe<br />
  2. 2. Vocabulary <br />
  3. 3. Galaxy<br />A group of stars, dust, and gases held together by gravity.<br />
  4. 4. Galaxy Cluster<br />A system of galaxies containing from several to thousands of member galaxies. <br />
  5. 5. Hubble’s Law<br />A law that states that the galaxies are retreating from the Milky Way at a speed that is proportional to their distance. <br />
  6. 6. Big Bang Theory<br />The theory that proposes that the universe originated as a single mass, which subsequently exploded. <br />
  7. 7. Key Concepts<br />
  8. 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. <br />
  9. 9. In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars. <br />
  10. 10. The red shifts of distant galaxies that the universe is expanding.<br />
  11. 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. <br />