Across
- 1. past,present,future
- 3. same kind
- 8. thermodynamic
- 9. big bang
- 10. high density and temperature
- 12. hot or cold
- 14. negatively
- 15. small particles
Down
- 2. direction
- 4. dominate radiation of pressure
- 5. compactness of a substance
- 6. opposite of matter
- 7. speed of light
- 11. wavelengths
- 13. electromagnetic radiation