Science vocab choice board

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