Across
- 2. what is An alternative term for the radiation era in the Big Bang theory, when the universe was hot and dense and was dominated by the effects of radiation
- 5. what is An object in space whose gravity is so strong not even light or other electromagnetic waves can escape.
- 6. what is Change in the apparent frequency of a wave as observer and source move toward or away from each other
- 7. what is The average density of matter needed for the Universe to halt its expansion, but only after an infinite time. A Universe with the critical density is said to be flat.
- 12. what is the interaction of electric currents or fields and magnetic fields.
- 13. what is A measure of how hot or cold something is.
- 14. what is study of the universe as a totality; theory of the origin and structure of the universe using astronomy and physics.
Down
- 1. what is 4 forces that shape the universe we inhabit. They include gravity, electromagnetic force, strong nuclear force and weak nuclear force
- 3. what is The twin of almost all the subatomic particles that make up our universe.
- 4. what is SI unit for thermodynamic temperature
- 8. what is Composed of particles that do not absorb, reflect, or emit light, they cannot be detected by observing electromagnetic radiation. Dark matter is material that cannot be seen directly.
- 9. what is When the gravitational effect of matter began to dominate the effect of radiation pressure.
- 10. what is shift of light to a longer wavelength as it moves away
- 11. what is A continuous rise in the price of goods and services
- 15. what is A huge collection of gas, dust, and billions of stars and their solar systems.