Chapters 17 and 18 Crossword

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Across
  1. 2. The cosmic microwave background radiation we now observe began during this time (3 words)
  2. 8. A continual rise in the rate by which our universe has been expanding (2 words)
  3. 9. Materials not made of protons and neutrons, responsible for most of the mass of galaxies and galaxy clusters(2 words)
  4. 10. Formation of new nuclei by fusion of protons during the first minutes of the Big Bang.
Down
  1. 1. Distortion of light from a far galaxy by a massive object closer to us (2 words)
  2. 3. The largest structure in the universe, containing many galaxy super clusters.
  3. 4. Indicates that there is a whole lot of unseen mass far from the visible portion of galaxies(3 words)
  4. 5. Force responsible for universal expansion (2 words)
  5. 6. Particles acquire mass as they through this field
  6. 7. Theory describing the expansion of the universe from a singularity (2 words)