Across
- 1. The change of internal energy of the open system, between its initial and final states of internal equilibrium
- 5. Progression of events from the past to the future
- 6. A hypothetical form of matter thought to account for approximately 85% of the matter in the universe
- 9. The science of the origin and development of the universe
- 10. The intensity of heat present in a substance or object
- 12. The radiation era in the Big Bang theory, during which the universe was hot and dense and was dominated by the effects of radiation
- 13. A point at which a function takes an infinite value, especially in space-time when matter is infinitely dense, as at the center of a black hole
Down
- 2. The interaction of electric currents or fields and magnetic fields
- 3. A nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy
- 4. A theory of the evolution of the universe, with its essential feature being the emergence of the universe from a state of very high temperature and density; the so called Big Band that occurred 13.8 billion years ago
- 7. The apparent change in frequency of a wave in relation to an observer moving relative to the wave source
- 8. A unit of astronomical distance equivalent to the distance light travels in a year, about 6 trillion miles
- 9. The density of matter that would be required to half the expansion of the universe
- 11. A displacement or difference in the apparent position of an object viewed along two different lines of sight
- 14. Displacement of spectral lines toward longer wavelengths in radiation from distant galaxies and celestial objects