Earth, Moon and Sun

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Across
  1. 3. a moon phase that looks like a full circle from earth
  2. 4. the nearly circular path a smaller object (like the moon) travels around a larger object (like earth)
  3. 8. the amount of time it takes for a planet to complete one orbit around a star or stars.
  4. 9. a sphere that travels around a planet
  5. 10. the relative size of things
  6. 11. something we observe to be similar over and over again
  7. 12. a moon phase that looks like more than a half circle from earth
  8. 13. an object,diagram or computer program that helps us understand something by making simpler or easier to see
  9. 14. the shape of the illuminated part of the moon as it appears from the earth
  10. 17. a planet outside our solar system
  11. 19. a moon phase that looks like less than half a circle from earth
Down
  1. 1. the sun, planets that orbit the sun and other objects that orbit the sun
  2. 2. a moon phase that looks like a half a circle from earth
  3. 5. the border between light and dark on the moon.
  4. 6. when the moon is completely dark
  5. 7. to shine light on an object and make it visible
  6. 15. a moon outside our solar system
  7. 16. the star that is the main source of light at the center of our universe
  8. 18. a moon phase that in which the moon is not visible from earth