big bang theory

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Across
  1. 2. the first chemical element
  2. 4. celestial bodies,measurements,and physical process
  3. 5. deciphering the vast and complex nature of the universe
  4. 10. discoverer of the cosmic microwave background radiation
  5. 13. the cooled remnant of the first light that could travel freely throughout the universe
  6. 16. a huge collection of dust, gas, and billions of stars and their solar system is all held by gravity
  7. 17. light element nuclei produce during the big bang
  8. 18. developed the special and general theories of relativity
Down
  1. 1. his work in radio astronomy
  2. 3. the foremost proponent and defender of the steady-state theory of the universe.
  3. 6. the range of wavelengths or frequencies over which electromagnetic radiation extends
  4. 7. includes all of space, and all of the matter and energy that space contains
  5. 8. band of the electromagnetic spectrum that is visible to the human eye
  6. 9. scientific model that explained how the universe began.
  7. 11. an instrument that breaks up a wave into a frequency spectrum.
  8. 12. the ability to do work
  9. 14. light from galaxies is shifted to longer wavelengths
  10. 15. a decrease in an electromagnetic wavelength caused by an motion of a celestial object