Big Bang Theory

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Across
  1. 4. The first element present in the universe
  2. 7. a spectrum used to study light
  3. 8. The start of the universe
  4. 9. The galaxy we live in
Down
  1. 1. what all matter is composed of
  2. 2. wrote the theory of relativity
  3. 3. all matter and space that exists
  4. 4. scientist that discovered galaxies are moving away from each other
  5. 5. the force that caused stars and galaxies to form
  6. 6. this was discovered when people kept hearing background sounds on their radio