Ch1&2EarthMoonSun

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Across
  1. 4. a rocky sphere that travels around a planet
  2. 8. to shine light on an object and make visible
  3. 11. the border between light and dark on the moon
  4. 12. describes moon phase that's less than half; a sliver
  5. 14. the star that is the main source of light at the center
  6. 15. related to the moon; this eclipse is when moon is darkened
Down
  1. 1. something we observe to be similar over and over again
  2. 2. describes the moon phase that looks like a full circle
  3. 3. the relative size of things
  4. 5. nearly circular path a smaller object travels around a larger object
  5. 6. describes the moon phase that's more than half a circle
  6. 7. the amount of time it takes for a planet to complete one orbit
  7. 9. a diagram or program that helps us understand something by making it simpler
  8. 10. phase of the moon that looks like a half-circle
  9. 13. related to the sun
  10. 16. the phase in which the Moon is not visible from Earth