the hypothesis that the universe is isotropic and homogeneous on a large scale: used to simplify the equations of general relativity for models of the universe.
(astronomy) the theory that the universe is uniform, homogenous, and isotropic, and therefore appears the same from any position
noun, Astronomy. 1. the part of the redshift of celestial objects resulting from the expansion of the universe.
[koz-mol-uh-jee] /kɒzˈmɒl ə dʒi/ noun 1. the branch of philosophy dealing with the origin and general structure of the universe, with its parts, elements, and laws, and especially with such of its characteristics as space, time, causality, and freedom. 2. the branch of astronomy that deals with the general structure and evolution of the universe. […]
[koz-muh-nawt, -not] /ˈkɒz məˌnɔt, -ˌnɒt/ noun 1. a Russian or Soviet astronaut. /ˈkɒzməˌnɔːt/ noun 1. an astronaut, esp in the former Soviet Union n. 1959, Englishing of Russian kosmonavt, ultimately from Greek kosmos (see cosmos) + nautes “sailor” (see naval). A crew member of a space mission launched by the former Soviet Union.
[koz-muh-naw-tiks, -not-iks] /ˌkɒz məˈnɔ tɪks, -ˈnɒt ɪks/ noun, (used with a singular verb) 1. astronautics, especially as applied to space flight.