Earth, moon, and sun

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