The Big Bang

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