Earth, Moon, and Sun

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