The Beginning Of The Universe
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 ...
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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 ...
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be known. 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. ...
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The Beginning Of The Universe. (2008, March 18). Retrieved November 28, 2024, from http://www.essayworld.com/essays/The-Beginning-Of-The-Universe/80742
"The Beginning Of The Universe." Essayworld.com. Essayworld.com, 18 Mar. 2008. Web. 28 Nov. 2024. <http://www.essayworld.com/essays/The-Beginning-Of-The-Universe/80742>
"The Beginning Of The Universe." Essayworld.com. March 18, 2008. Accessed November 28, 2024. http://www.essayworld.com/essays/The-Beginning-Of-The-Universe/80742.
"The Beginning Of The Universe." Essayworld.com. March 18, 2008. Accessed November 28, 2024. http://www.essayworld.com/essays/The-Beginning-Of-The-Universe/80742.
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