The Big Bang

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Across
  1. 5. did not exist before the big bang
  2. 6. a collection of stars planets and other matter held together by gravity
  3. 8. dark matter isn't visible to us because it produces no ____ radiation
  4. 10. scientist who observed that the Universe was expanding
  5. 12. galaxies that are _______ are moving away from us
  6. 13. the further away a galaxy is the ______ it is said to be moving
  7. 14. shown by galaxies moving towards us
  8. 16. the theory that masses apply a force of attraction on other masses
Down
  1. 1. most abundant element in the universe
  2. 2. the effect observed when an ambulance drives away from you
  3. 3. our galaxy
  4. 4. the Universe may end in a big ______
  5. 7. as the Universe expands it ____ in temperature
  6. 9. leftover heat from the big bang
  7. 11. balls of gas that produce light and heat energy
  8. 15. everything that exists