Space

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Across
  1. 4. a vast expanse full of celestial objects
  2. 7. to spin on one's own axis
  3. 8. the blue planet
Down
  1. 1. a natural or artificial body which moves around a planet
  2. 2. a spiral galaxy
  3. 3. to move around another body along an orbit
  4. 5. a fixed path on which planets move around stars
  5. 6. a hot glowing celestial object