Across
- 2. Rotating star.
- 4. Orbits a star.
- 10. Celestial body.
- 11. Space rock.
- 14. Ringed planet.
- 16. Celestial event.
- 18. Star nursery.
- 19. Closest to sun.
- 20. Moon-related.
- 22. Red planet.
Down
- 1. Gravity well.
- 3. Shooting star.
- 5. Blue planet.
- 6. Bright core.
- 7. Earth's satellite.
- 8. Gas giant.
- 9. Icy visitor.
- 12. Star system.
- 13. Bright morning star.
- 14. Sun-related.
- 15. Tilted planet.
- 17. Our star.
- 21. Northern lights.