Earth, Moon, and Sun Extra Credit Crossword

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Across
  1. 4. the relative size of things
  2. 6. to shine light on an object to make it visible
  3. 7. a moon phase where the Moon isn't visible from Earth
  4. 8. the shape of the illuminated part of the Moon
  5. 13. a nearly circular path a smaller object travels around a larger object
  6. 14. a planet outside our solar system
  7. 15. a moon outside our solar system
  8. 16. moon phase that looks like less than half a circle from Earth
  9. 18. the amount of time it takes a planet to complete one orbit around it's star
Down
  1. 1. an object that travels around a planet
  2. 2. a moon phase that looks like half a circle from Earth
  3. 3. having to do with the moon
  4. 5. a moon phase that looks more than a half circle from Earth
  5. 8. a rocky sphere that travels around a planet
  6. 9. something we observe to be similar over and over again
  7. 10. when the Sun or Moon is completely dark from a shadow
  8. 11. a moon phase that looks like a full circle from Earth
  9. 12. the border between light and dark on the Moon
  10. 17. the star that is the main source of light at the center of our solar system