Big bang

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Across
  1. 3. the bigbang was a sudden helium the universe's second most consisted element
  2. 4. all of space and time
  3. 7. discovered redshift
  4. 8. temperature or heat leftover from the bigbang
  5. 10. the universe is
  6. 12. the universe consists mainly of
Down
  1. 1. the universe is thought to be _____
  2. 2. empty part of the universe
  3. 5. first major piece of evidence of the big bang
  4. 6. the big bang is a _____
  5. 9. thought to be the thing that started our universe
  6. 11. used to study light