Our Universe

  1. What is the Big Bang Theory?
    The dominant scientific theory about the origin of the Universe
  2. What is the approximate age of the Universe?
    13.7 billion years
  3. What does a cosmologic red shift imply?
    objects are moving   a w a y   from us
  4. Describe the concept of the expansion of space, and compare the velocities of expansion with distances of galaxies further away from us.
    • Further = Faster
    • the galaxy is moving away from us
  5. What is CMB (Cosmic Microwave Background Radiation)?
    The temperature or energy left over from the Big Bang
  6. What does the latest evidence imply about the fate of our universe?
    will probably expand forever
  7. About how much dark matter and dark energy make up our know universe?
    • dark matter = 25%
    • dark energy = 70%
  8. How fast does the light travel in miles per second?
    186,000 miles per second
  9. Who first proved that galaxies are located outside our own galaxy?
    Edwin Hubble
  10. What three galactic type make up the Hubble classification of galaxies?
    • Elliptical
    • Spiral
    • Irregular
  11. Where is the location of the older and younger stars in the typical spiral galaxies?
    • central old yellow stars
    • younger blue stars along spiral arms
Card Set
Our Universe
Unit 3