Sun Earth Moon Systems

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Across
  1. 6. landed Neil Armstrong and Edwin Aldrin on the moon
  2. 7. made of silicon and oxygen
  3. 8. distance between peaks on a wave
  4. 10. distance light travels in a year
  5. 12. number of waves per second
  6. 14. first American on the moon
  7. 16. when the sun is directly over the equator
  8. 17. direction the sun rises
Down
  1. 1. first human in space
  2. 2. valleylike structures on the moon
  3. 3. closest point in moon's orbit to Earth
  4. 4. the time from one noon to the next
  5. 5. heavy cratered regions of the moon
  6. 9. dark smooth plains of elevation on the moon
  7. 11. 12% of sunlight
  8. 13. direction the sun sets
  9. 15. farthest point in moon's orbit to Earth