Earth, Moon, and Sun Vocabulary test

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