Light

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Across
  1. 3. to send something across places; to pass along
  2. 5. combination of all colors
  3. 6. Permitting light to pass through, but not transparent
  4. 7. reflection of light in all directions
  5. 8. light distance travels in years (5.88 trillion)
  6. 9. not letting light through
  7. 11. A space where no particles of matter exist
Down
  1. 1. light that gives off heat
  2. 2. light with wavelengths shorter than those of visible
  3. 4. tiny pieces of light
  4. 6. Allowing light to pass through
  5. 10. A piece of glass that separates white light into colors of the spectrum.
  6. 12. to take in