Introducing the Sun-Earth-Moon System

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Across
  1. 2. imaginary rotation line of Earth
  2. 5. about one fourth the diameter of Earth
  3. 6. the moon revolves around this planet
  4. 7. the widest point across the equator
  5. 8. 108 Earths can fit across its diameter
  6. 10. the organization of our solar system
  7. 13. gather light so we can see dim objects
  8. 14. receive electromagnetic waves
Down
  1. 1. time it takes for Earth to rotate once
  2. 3. Identify elements on stars using light
  3. 4. ground-based robots
  4. 5. one revolution of the moon around Earth
  5. 9. one revolution of Earth around the sun
  6. 11. Earth's journey around the sun
  7. 12. man-made ones orbit other planets