Earth, Moon, and Sun

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Across
  1. 4. a moon phase that looks like less than half a circle from earth
  2. 7. the border between light and dark on the Moon
  3. 8. the amount of time it takes for a planet to complete one orbit around a star or stars
  4. 9. a planet outside our solar system
  5. 10. something wee observe to be similar over and over again
  6. 12. a moon phase that looks like a full circle from Earth
  7. 15. a moon outside our solar system
  8. 16. the star that is the main source of light at the center of our solar system
  9. 17. the nearly circular path a smaller object (like the Moon) travels around a larger object (like Earth)
  10. 18. a moon phase that looks like a half-circle from Earth
Down
  1. 1. the shape of the illuminated part of the Moon as it appears from Earth
  2. 2. the state or condition in which there is no apparent force of gravity acting on a body
  3. 3. to shine light on an object and make it visible
  4. 5. when the Moon is completely dark
  5. 6. a moon phase that looks like more than half a circle from Earth
  6. 11. the sun, the planets that orbit the sun, and other objects that orbit the sun
  7. 13. a moon phase in which the moon is not visible from Earth
  8. 14. a rocky sphere that travels around a planet