<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The study of galaxy formation and evolution is concerned with the processes that formed a heterogeneous universe from a homogeneous beginning, the formation of the first galaxies, the way galaxies change over time, and the processes that have generated the variety of structures observed in nearby galaxies . </P> <P> Galaxy formation is hypothesized to occur, from structure formation theories, as a result of tiny quantum fluctuations in the aftermath of the Big Bang . The simplest model for this that is in general agreement with observed phenomena is the Λ - Cold Dark Matter cosmology; that is to say that clustering and merging is how galaxies gain in mass, and can also determine their shape and structure . </P> <P> Because of the inability to conduct experiments in outer space, the only way to "test" theories and models of galaxy evolution is to compare them with observations . Explanations for how galaxies formed and evolved must be able to predict the observed properties and types of galaxies . </P>

What is the most likely way that one type of galaxy may be formed from others