Earth, Moon, and Sun

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