Earth, Moon, and Sun

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