The 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, 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 ...

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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 ...

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However, recent theoretical breakthroughs, based on the principles of
quantum theory, have suggested that space, and the matter within it, masks an
infinitesimal realm of utter chaos, where events happen randomly, in a state
called quantum weirdness.4
Before the universe began, this chaos was all there was. At some time, a
portion of this randomness happened to form a bubble, with a temperature in
excess of 10 to the power of 34 degrees Kelvin. Being that hot, naturally it
expanded. For an extremely brief and short period, billionths of billionths of
a second, it inflated. At the end of the period of inflation, the universe may
have a diameter of a few centimetres. The ...

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PAPER DETAILS
Added: 10/16/2007 10:31:26 PM
Category: Science & Nature
Type: Premium Paper
Words: 1283
Pages: 5

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