Galaxy evolution or
evolution of galaxy is a term that we have used for understanding the
formation process and changes of galaxies since the beginning that
made up the known universe. The term galaxy evolution also represents
the models we form about the universe filled by the observed photons
and the expansion since the big bang. At this point, the sizes,
shapes and contents of all galaxies give us an idea about the
formation and evolution of the universe.
Detailed Definition:
Galaxy evolution is a term
used to understand the structure of the universe and the ongoing
formation processes by comparing the morphology, brightness and
content of galaxies with each other. The term galaxy evolution here
studies galaxies in four main groups. These are Elliptical Galaxies,
Lenticular Galaxies, Spiral Galaxies, and Irregular galaxies. The
evolution process of galaxies in these four groups is examined under
three main headings. These are Passive evolution (The state where the
galaxy does not interact with any other galaxy [interactions or
mergers] and thus does not produce star formations.), Interactions
and Mergers (The state in which galaxies are affected by interacting
with other galaxies), Secular Evolution (Situation in which processes
by internal changes of galaxies affect their colour, luminosity and
shape.)
Etymology:
From Latin ‘Galaxias’
and From Latin ‘ēvolūtiōnis’ (Unrolling/Unfolding)
Sample Sentence(s):
‘’Radio telescopes have
played a pivotal role in the understanding of galactic evolution.’’
(Galaxy
Evolution, Cosmology and Dark Energy. (2018, May 30). Public Website.
