Earth, Moon, Sun

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Across
  1. 3. a Moon outside the solar system
  2. 6. huge star
  3. 7. relative size of things
  4. 10. to shine
  5. 12. Eclipse when the Moon is completely dark
  6. 13. Moon can't see the Moon from Earth
  7. 14. a planet outside our solar system
  8. 17. the border between light and dark on the moon
  9. 18. Moon a half circle
Down
  1. 1. Moon More than a half circle
  2. 2. a sphere made of rock;travels around a planet
  3. 4. Moon full circle
  4. 5. object, diagram, computer program
  5. 6. System planets
  6. 8. Moon less than a half circle
  7. 9. something similar;repeating
  8. 11. Phase visible part of the Moon
  9. 15. almost circle path a smaller object travels around a larger one
  10. 16. the amount of time it takes for a planet to complete one orbit