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