Big Bang Theory

2. any of the four basic forces—gravitational, electromagnetic, strong, and weak—that govern how objects or particles interact and how certain particles decay
5. of or resembling the earliest ages in the history of the world.
6. a component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity
7. the SI base unit of thermodynamic temperature, first introduced as the unit used in the Kelvin scale
9. a region of space having a gravitational field so intense that no matter or radiation can escape
12. the interaction of electric currents or fields and magnetic fields.
14. the average density of matter required for the Universe to just halt its expansion, but only after an infinite time
15. the change in the wavelength or frequency of the waves with respect to the observer who is in motion relative to the wave source.

1. The period in the evolution of the universe, beginning roughly 105 years after the big bang, when the universe had cooled to the point at which electrons and protons were able to form neutral hydrogen atoms
3. the idea that the nascent universe passes through a phase of exponential expansion that was driven by a negative-pressure vacuum energy density
4. the science of the origin and development of the universe. Modern astronomy is dominated by the Big Bang theory, which brings together observational astronomy and particle physics.
8. a unit of astronomical distance equivalent to the distance that light travels in one year
10. a variable star having a regular cycle of brightness with a frequency related to its luminosity, so allowing estimation of its distance from the earth
11. 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 or perceived by touch
13. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.