Across
- 3. opposite of matter
- 7. that started the gravitational effect
- 8. change in wavelength or frequency
- 10. goes up
- 13. very intense gravity
- 14. interaction of electrical charges
Down
- 1. radiation era in the big bang
- 2. strong to weak
- 4. type of star that pulsates radially
- 5. average density of something
- 6. we live in one of these
- 9. hot or cold
- 11. distance
- 12. unit of measurement in temperature
- 15. study of space