Big Bang

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Term Paper Title	Big Bang
# of Words	1326
# of Pages (250 words per page double spaced)	5.3

Big Bang

It is always a mystery about how the universe began, whether if and when it will
end. Astronomers construct hypotheses called cosmological models that try to
find the answer. There are two types of models: Big Bang and Steady State.
However, through many observational evidences, the Big Bang theory can best
explain the creation of the universe. The Big Bang model postulates that about
15 to 20 billion years ago, the universe violently exploded into being, in an
event called the Big Bang. Before the Big Bang, all of the matter and radiation
of our present universe were packed together in the primeval fireball--an
extremely hot dense state from which the universe rapidly expanded.1 The Big
Bang was the start of time and space. The matter and radiation of that early
stage rapidly expanded and cooled. Several million years later, it condensed
into galaxies. The universe has continued to expand, and the galaxies have
continued moving away from each other ever since. Today the universe is still
expanding, as astronomers have observed. The Steady State model says that the
universe does not evolve or change in time. There was no beginning in the past,
nor will there be change in the future. This model assumes the perfect
cosmological principle. This principle says that the universe is the same
everywhere on the large scale, at all times.2 It maintains the same average
density of matter forever. There are observational evidences found that can
prove the Big Bang model is more reasonable than the Steady State model. First,
the redshifts of distant galaxies. Redshift is a Doppler effect which states
that if a galaxy is moving away, the spectral line of that galaxy observed will
have a shift to the red end. The faster the galaxy moves, the more shift it has.
If the galaxy is moving closer, the spectral line will show a blue shift. If the
galaxy is not moving, there is no shift at all. However, as astronomers
observed, the more distance a galaxy is located from Earth, the more redshift it
shows on the spectrum. This means the further a galaxy is, the faster it moves.
Therefore, the universe is expanding, and the Big Bang model seems more
reasonable than the Steady State model. The second observational evidence is the
radiation produced by the Big Bang. The Big Bang model predicts that the
universe should still be filled with a small remnant of radiation left over from
the original violent explosion of the primeval fireball in th...

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