The Universe

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Across
  1. 2. a change in the frequency of waves as the source and observer movetoward (or away from) each other
  2. 4. the name of our planetary system
  3. 5. light waves shift towards red due to objects moving away from each other
  4. 6. the biggest circle in the structure model
  5. 10. the smallest circle in the structure model
  6. 13. the name of our galaxy
  7. 14. determine the chemical makeup of a substance based on the light itemits
  8. 16. The infinitely small and dense spot the universe was originally packed into
Down
  1. 1. the second smallest circle in the structure model
  2. 3. the 2 most common gases in the universe
  3. 7. the estimated age of the universe
  4. 8. the second biggest circle in the structure model
  5. 9. word that describes the expanding of the singularity
  6. 11. the universe is __________.
  7. 12. low energy radiating in every direction in the universe
  8. 15. the most accepted explanation for the creation of the universe,the universe was created from an explosion or rapid expansion