The Big Bang

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Across
  1. 4. our galaxy
  2. 6. scientist who observed that the Universe was expanding
  3. 7. balls of gas that produce light and heat energy
  4. 8. as the Universe expands it ____ in temperature
  5. 11. the effect observed when an ambulance drives away from you
  6. 12. a collection of stars planets and other matter held together by gravity
Down
  1. 1. everything that exists
  2. 2. the theory that masses apply a force of attraction on other masses
  3. 3. leftover heat from the big bang
  4. 5. shown by galaxies moving towards us
  5. 9. most abundant element in the universe
  6. 10. shown by galaxies moving away from us