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Big Bang - College Essays

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: and Steady State. However, through many observational evidences, the theory can best explain the creation of the universe. The model postulates that about 15 to 20 billion years ago, the universe violently exploded into being, in an event called the . Before the , 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 was the start of time and space. The matter ...

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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 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 model seems more reasonable than the Steady State model. The second observational evidence is the radiation produced ...

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PAPER DETAILS

Added: 3/31/2005 02:52:55 AM
Category: Science & Nature
Type: Premium Paper
Words: 1243
Pages: 5

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