Across
- 3. solar atmosphere
- 6. time to complete one full spin on its axis
- 9. complete trip through an orbit
- 10. shooting stars
- 11. big ball of gas which gives off light and heat
- 12. invisible force which holds objects in place
- 14. made of many galaxies
Down
- 1. made of many solar systems
- 2. object orbiting a planet
- 4. regular repeating path
- 5. cosmic snowballs
- 7. an object orbiting a star
- 8. star and objects travelling around it
- 13. rocky, airless worlds