Earth, Moon, and Sun

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