Earth, Moon and Sun

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