Across
- 3. of the same or a similar kind or nature
- 6. antiparticle of a proton
- 7. the basic building block of chemistry
- 9. is the change in frequency of a wave
- 11. the era that started when the gravitational effect of matter began to dominate the effect of radiation pressure
- 12. unit of the temperature
- 14. study of the universe
- 15. the degree or intensity of heat present in a substance or object especially as expressed according to a comparative scale and shown by a thermometer
Down
- 1. an increase in wavelength
- 2. exhibiting properties
- 4. early time in the universe
- 5. hypothetical form of matter thought to account for the matter of the universe
- 8. average density of matter required for the universe
- 10. a particle representing a quantum of light or other electromagnetic radiation
- 13. a universal physical constant that is important in many areas of physics