Across
- 3. planetesimals,
- 6. super-galaxy,
- 8. dwarf,
- 9. galaxies,
- 10. spiral arms,
- 12. astronomer,
- 13. system, big bang,
- 14. light,
- 16. clouds, gravity,
- 17. Orion arm,
Down
- 1. telescope,
- 2. protostar
- 4. milky way,
- 5. dust,
- 7. stars,
- 11. universe,
- 15. spiral,