Earth, Moon and Su

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Across
  1. 2. A moon phase that looks like less than half a circle from Earth
  2. 6. The nearly circular path a smaller object travels around a larger object
  3. 8. The shape of the illuminated part of the Moon as it appears from Earth
  4. 10. The star that is the main source of light at the center of our solar system
  5. 11. The border between light and dark on the Moon
  6. 12. The relative size of things
Down
  1. 1. When the Moon is completely dark
  2. 3. To shine light on an object and make it visible
  3. 4. Something we observe to be similar over and over again
  4. 5. A moon phase that looks like a full circle from Earth
  5. 7. A rocky sphere that travels around a planet
  6. 9. An object, diagram, or computer program that helps us understand something