Science

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Across
  1. 4. the disance light travels in one year
  2. 5. a huge collection of stars
  3. 7. complete spectrum of light
  4. 10. one crest and one trough
  5. 11. the top of a wave
  6. 12. the length of a wave
  7. 13. the rate he waves peak passes by a point
Down
  1. 1. refers to a portion of the entire electromagnetic spectrum
  2. 2. a star that changes in brightness
  3. 3. the amount of waves per second
  4. 6. apparent shift in position of a star
  5. 8. the amount of light that reaches us
  6. 9. the bottom of a wave