Earth, Moon and Sun

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