Big Bang Vocabulary

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Across
  1. 2. Wilson & Penzias, heard this over air waves when working on a radio
  2. 4. First atom
  3. 5. Theory that galaxies are moving apart from each other
  4. 7. 5 billion years
  5. 8. First subatomic particle
  6. 10. Theory of relativity
Down
  1. 1. 73% H 25% He 2% everything else
  2. 3. During the beginning the universe was full of
  3. 6. Theory that the universe is constantly expanding
  4. 9. Used to study light