Earth, Moon, And Sun

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