Earth Moon Sun

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Across
  1. 4. relative size of things
  2. 7. moon's face in shadow at the beginning of a lunar cycle
  3. 8. part of moon's illuminated face decreasing
  4. 9. path an object makes circling another object, like the moon going around Earth
  5. 11. less than half of moon's face illuminated
  6. 13. bowl shaped depression in surface of moon
  7. 14. to shine light on something & make it visible
  8. 16. star that gives heat & light for the solar system
  9. 17. object diagram or program that helps understanding
  10. 18. about one lunar cycle
Down
  1. 1. more than half the moon's face illuminated
  2. 2. something that happens over & over & over
  3. 3. moon's face getting more fully illuminated
  4. 5. shape of illuminated part of moon as seen from Earth
  5. 6. how something looks from a certain location
  6. 10. border between light & dark on the moon
  7. 12. moon's face completely lit up by the Sun's light
  8. 15. rocky sphere that travels around a planet in orbit