Earth, Moon, and Sun

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