Earth, Moon, and Sun

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