Earth, Moon, and Sun

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