UNIVERSE

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Across
  1. 2. universe passes through successive cycles of expansion and contraction
  2. 4. Cosmic Microwave Background
  3. 5. there is a definite beginning and end to the universe
  4. 7. the universe has no beginning nor end
  5. 9. comprehensive explanation of the observed phenomenon
Down
  1. 1. studies the origin and evolution of the universe
  2. 3. announced his significant discovery of the "red shift"
  3. 4. act or acts by which the world came into existence out of nothing
  4. 6. studies the stars, planets, comets, etc.
  5. 8. Shift long wavelength, proves that galaxies are moving away from each other