The Big Bang

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Across
  1. 4. shown by galaxies moving towards us
  2. 10. as the Universe expands it ____ in temperature
  3. 11. most abundant element in the universe
  4. 12. the effect observed when an ambulance drives away from you
  5. 14. the theory that masses apply a force of attraction on other masses
  6. 15. the Universe may end in a big ______
Down
  1. 1. leftover heat from the big bang
  2. 2. our galaxy
  3. 3. everything that exists
  4. 5. balls of gas that produce light and heat energy
  5. 6. a collection of stars planets and other matter held together by gravity
  6. 7. scientist who observed that the Universe was expanding
  7. 8. did not exist before the big bang
  8. 9. galaxies that are _______ are moving away from us
  9. 13. the further away a galaxy is the ______ it is said to be moving