<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>
what is the most likely way that one type of galaxy may be formed from others
tiny quantum fluctuations in the aftermath of the Big Bang