The Big Bang

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