However the current rate of galaxy mergers does not explain how all galaxies move from the blue cloud to the red sequence it also does not explain how star formation ceases in galaxies theories of galaxy evolution must therefore be able to explain how star formation turns off in galaxies this phenomenon is called galaxy quenching. Evolution of stars and galaxies just as ring structure gives us clues about the history of this tree galaxy structure provides evidence about the evolution of the universe a consequence of the big bang theory is the evolution of the universe over time. Galaxy galaxy evolution of galaxies and quasars 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 . As with star formation gas and dust gathered collapsed forming stars in large groups lumps of matter left over from the big bang grouped together to form galaxies continual evolution galaxies continue to merge and collide with each other creating larger galaxies and increasing star formation. The origin and evolution of galaxies as the forming galaxies grew smaller the gas tended to fall into a flat plane with fragmentation into stars occurring during both the collapse phase and continuing after formation of the final disk
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