The Big Bang

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