Big Bang Crossword

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Across
  1. 4. particles that helped form the objects in the universe
  2. 9. all space and matter that exists
  3. 10. a theory about the universe
Down
  1. 1. a tool used to study light
  2. 2. a fundamental particle with nuclear forces
  3. 3. a scientist known for his theory of relativity
  4. 5. relic radiation left over after the beginning of the universe
  5. 6. what the universe did after the big bang
  6. 7. one of the first elements created element #1
  7. 8. makes up about 25% of the mass in space