Across
- 3. core collapse
- 4. sun red giant
- 7. surface formed
- 11. shrinks
- 12. typical star
- 13. adopted as zero longitude
- 15. our galaxy
- 17. formed by aggregation
- 19. building blocks
- 21. earth falling debris
- 25. big bang
- 27. spinning skater
- 28. cause massive clouds
- 29. rain fall
- 30. early mixed
Down
- 1. still happens today
- 2. types of galaxies
- 5. experiment 1953
- 6. massive spheres
- 8. protects from UV
- 9. heat vents in sea
- 10. middle of planet
- 14. inner concentrated material
- 16. parallel lines
- 18. theory of planets formed
- 20. small into large
- 22. galaxies
- 23. water collects
- 24. connects polar water
- 26. stars and planets