Earth,Moon and sun vocab

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