Earth, Moon, And Sun

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