light

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