Big Bang

n (cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about 2.725 kelvin

(cosmology) a brief exponential expansion of the universe (faster than the speed of light) postulated to have occurred shortly after the big bang n

n (cosmology) the original matter that (according to the big bang theory) existed before the formation of the chemical elements