Across
- 1. Even light cannot escape it (two words)
- 3. Could have been a star
- 6. Zero latitude
- 7. mass over volume
- 8. before nuclear fusion
- 17. Largest entity in universe
- 21. Runaway greenhouse planet
- 24. Location of heavy elements formation
- 25. Milky Way, for example
- 26. Bright, cool, large star type (two words)
- 28. Oldest life
- 30. Disappearance of species
- 31. Renewable energy source
- 33. 0.00001 km
- 34. stellar nurseries
- 36. one thousand million
- 37. Ringed planet
- 38. educated guess
Down
- 2. star classification (two words)
- 4. System response
- 5. Mass unit
- 9. rainbow of colors
- 10. solar acne?
- 11. hottest stars
- 12. Start of time?
- 13. sought by Brahe
- 14. Dinosaur era
- 15. Product of respiration (two words)
- 16. Navigator's star
- 18. orbit
- 19. Dirty snowball
- 20. _______ unit (Earth to Sun)
- 22. fastest spinner
- 23. Sun-centered
- 27. First telescope user
- 29. Earth's center
- 32. Closed universe's fate (two words)
- 35. Evidence of oxygen in ancient oceans