Across
- 5. / Era that started when the gravitational effect of matter begBan
- 8. / The cosmic microwave
- 12. / The uniform microwave radiation remaining
- 18. /Has the same value when measured in different directions
- 19. /The basic unit of a chemical
- 20. / The displacement of spectral lines
- 21. / The same observational evidence is available to observers
- 22. / The degree of the compactness of a substance
- 24. / How hot of cold it is
Down
- 1. /A component of the universe whose presence is discerned from its gravitational attraction
- 2. /A particle representing a quantum of light
- 3. / Molecules formed by atoms consisting of antiprotons,antineutrons,and positrons
- 4. / Theory of the evolution of the Universe
- 6. / The negatively charged proton
- 7. /Early time in the Universe
- 8. /Required for the Universe to just halt its expansion
- 9. / Any of the four basic forces
- 10. / The heat death of the universe
- 11. / Launched into the Earths lower orbit
- 13. / When radiation has a non-zero radial velocity
- 14. / A temperature
- 15. / A contraction of the universe to a state of extremely night density
- 16. / Speed at witch light waves travel
- 17. /the origin and development of the universe
- 23. / The existence and events in the past,present,and future