Earth, Moon, and Sun

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Across
  1. 6. a moon phase in which the Moon is not visible from Earth
  2. 9. a moon phase that looks like less than half a circle from Earth
  3. 10. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
  4. 11. a rocky sphere that travels around a planet
  5. 12. a planet outside our solar system
Down
  1. 1. to shine light on an object and make it visible
  2. 2. a moon outside our solar system
  3. 3. a moon phase that looks like more than half a circle from Earth
  4. 4. a moon phase that looks like a full circle from Earth
  5. 5. when the Moon is completely dark
  6. 7. the shape of the illuminated part of the Moon as it appears from Earth
  7. 8. the nearly circular path a smaller object (like the Moon) travels around a larger object (like Earth).