Earth, Moon, and Sun

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