Earth & Space Science

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Across
  1. 2. wavelength of the light stretches
  2. 4. scientific explanation for how the universe began
  3. 5. an american astronomer
  4. 6. space between stars and galaxies
  5. 7. galaxies are moving away from us
Down
  1. 1. a light source is moving away from us
  2. 3. suggest that the universe has always existed
  3. 8. can provide crucial evidence about the composition of matter in the universe