After the 1930s when galaxies were deep-rooted as the
elementary building blocks of the universe, and their origin
and evolution has lingered a central spotlight of physical
cosmology. One of the possible ends suggested by
cosmologists is Big Crunch (there are also some other
concepts like Big Rip, Ever expanding etc.). The Big Crunch
is also referred to as the Gnab Gib (Big Bang read
backwards). In cosmology, the Big Crunch is a proposition
that suggest that the universe will stop expanding and begin
to collapse upon it. It is a counterpart to the Big Bang.
If the gravitational attraction of all the matter in the
visible horizon is high enough, then it may stop the
expansion of the universe, and then reverse it. Speculation
about the environment of galaxies started even in the 18th
century and the work of thinkers such as Thomas Wright of
Durham and Immanuel Kant. Today, the prevailing theoretical
ideas circle around a 20-year-old proposal that the origin
of galaxies should be sought in quantum fluctuations
generated at the time of the big bang. As with all problems
in physics, the answer to the anonymity of galaxy
configuration requires the interplay between theoretical
ideas and experimental data. The actual age of the universe
depends on the Hubble constant, the density of matter in the
universe and the value of the cosmological constant.