moon earth and sun

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Across
  1. 5. Something we observe over and over again
  2. 6. The border between light and dark side of moon
  3. 9. A moon phase that looks like a full circle from earth
  4. 10. An object diagram our computer program that helps us understand by making it simpler
  5. 13. A moon outside our solar system
  6. 14. The relative size of things
  7. 15. The sun the planets that orbit the earth
  8. 16. moon A phase that looks like less then half a circle from earth
  9. 17. The amount of time it takes for a planet to complete one orbit around a star or stars
  10. 18. The nearly path smaller object like the moon travels around the earth
Down
  1. 1. The shape of the illuminated part of the moon as it appears from earth
  2. 2. A moon phase in which the moon is not as visible from earth
  3. 3. When moon is completely dark
  4. 4. A moon phase that look like a full more then a half moon
  5. 7. The stars that is main source of light at center of of are solar system
  6. 8. A rocky sphere that travels
  7. 11. A planet outside are solar system
  8. 12. To shine light on an object