The Big Bang Theory

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Across
  1. 2. 2nd lightest element
  2. 4. law of thermodynamic big bang violates
  3. 5. my favorite medicine
  4. 9. one of the four forces of nature
  5. 12. found at the center of a black-hole
  6. 15. formed from the collapse of gases
  7. 16. the universe is ____ billion years old
  8. 17. last name of person who coined "The Big Bang"
Down
  1. 1. as the universe expands it also ______
  2. 2. the universe is mostly comprised of this element
  3. 3. nothing is faster than the speed of ______
  4. 6. matter that we can not observe
  5. 7. first name of person who coined "The Big Bang"
  6. 8. term for the collapse of the universe
  7. 10. day this crossword was made
  8. 11. 3rd lightest element
  9. 13. rapid expansion of the universe
  10. 14. type of matter we can observe