big bang theory

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Across
  1. 2. the segment of the electromagnetic spectrum that the human eye can view.
  2. 3. The theory that the universe originated billions of years ago in a rapid expansion from a single point of nearly infinite energy density
  3. 6. an instrument that separates incoming light by its wavelength or frequency and records the resulting spectrum in some kind of multichannel detector, like a photographic plate
  4. 9. leftover radiation from the Big Bang or the time when the universe began
  5. 10. the displacement of the spectrum of an approaching celestial body toward shorter wavelengths.
  6. 11. theories about light, motion, gravity, mass and energy led to the big-bang theory.
Down
  1. 1. the range of wavelengths or frequencies over which electromagnetic radiation extends.
  2. 4. the wavelength of the light is stretched, so the light is seen as 'shifted' towards the red part of the spectrum
  3. 5. believed that the Universe had no beginning, and that new galaxies formed in the gaps as others moved apart.
  4. 7. law allowed astronomers to calculate how long ago galaxies started moving apart. This helped calculate when the big bang theory was.
  5. 8. the branch of science which deals with celestial objects, space, and the physical universe as a whole