Why is Space Black?

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Across
  1. 1. the color of space
  2. 3. light travels in ____
  3. 5. there is a lot of ___ space between objects in space
  4. 6. color of the sky due to Earth's atmosphere
  5. 8. scientific instrument designed to detect various forms of light
  6. 10. light waves can be absorbed, transmitted or ___
Down
  1. 2. unlike Earth space does not have a(n) ___
  2. 4. as the universe expands light waves become ___
  3. 7. the type of path light travels in space
  4. 9. the form of energy that allows us to see the world around us