Galaxy - Evolution, Quasars, Structure
Galaxy - Galaxy - Evolution, Quasars, Structure: The study of the origin and evolution of galaxies and the quasar phenomenon has only just begun. Many models of galaxy formation and evolution have been constructed on the basis of what we know about conditions in the early universe, which is in turn based on models of the expansion of the universe after the big bang (the primordial explosion from which the universe is thought to have originated) and on the characteristics of the cosmic microwave background (the observed photons that show us the light-filled universe as it was when it was a few ...