The Big Bang Theory

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Across
  1. 2. Simplest-lightest-most-abundant-chemical-element
  2. 4. The-branch-of-science-that-deals-with-celestial-objects
  3. 5. Groundbreaking-American-astronomer
  4. 10. American-radio-Astronomer
  5. 13. Faint-uniform-remnant-radiation-leftover-from-the-big-bang
  6. 16. A-system-of-millions-or-billions-of-stars
  7. 17. Colorless-odorless-tasteless-and-non-toxic-inert-gas
  8. 18. German-born-theoretical-physicist
Down
  1. 1. German-American-physicist-and-radio-astronomer
  2. 3. Prominent-British-astrophysicist-and-cosmologist
  3. 6. The-entire-range-of-all-types-of-electromagnetic-radiation
  4. 7. All-existing-matter-and-space-considered-as-a-whole
  5. 8. Narrow-band-of-electromagnetic-radiation
  6. 9. The-creation-of-the-universe
  7. 11. An-apparatus-for-photographing
  8. 12. The-strength-and-vitality-required-for-sustained-physical-or-mental-activity
  9. 14. The-stretching-of-light-waves-towards-longer-redder-wavelength
  10. 15. A-decrease-in-wavelength