Earth,Moon,Sun

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