Earth, Moon and Sun Crossword

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