Earth,Moon and the Sun

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Across
  1. 1. the shape of the illuminated part of the moon which is visual from the Earth
  2. 5. which we see appears to be similar again and again
  3. 6. size of an object
  4. 9. a moons phase where it looks like a full circle
  5. 11. a moon phase which looks more than a half circle from Earth
  6. 12. a star which is the main source of light at the center of the solar system
  7. 13. a moon that has phase where we can see half of a circle from the Earth
  8. 15. a path of a planet
  9. 17. a phase which we cannot see the moon from the Earth
  10. 18. the line between the light and the dark source
Down
  1. 1. a rocky planet which travels around the planets
  2. 2. a planet which is not there in the solar system
  3. 3. when the moon is fully covered by a dark color
  4. 4. to shine the light on an object to make it visible
  5. 7. a moon phase that looks like less than half a circle from Earth.
  6. 8. an object or a computer program which is easier to see and use
  7. 10. group of planets orbiting a star
  8. 14. a moon outside our solar system
  9. 16. the amount of time which it takes a planet to complete one orbit around a star or stars