Thursday, December 15, 2011

essay

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Science Presentation


Good morning fellow classmates. Have you ever wondered how our universe came into existence? Well…many scientists have tried to theorize how our universe was created but of course there is no way is proving their theories entirely. The most widely accepted theory is called the big bang theory. The big bang theory was created from field equations based on the theory of relativity made by Albert Einstein. Alexander Friedmann and George gamnow used Albert Einstein’s theory of relativity to create the big bang theory. Basically this theory states that 15 billion years ago, everything was very quiet. There was no light, no time, and nothing existed. Then suddenly a big explosion occurred and set free all the matter in the universe. During the first 10^-4 seconds after the big bang, the four fundamental forces of gravity, electromagnetism, and the strong and weak nuclear forces were unified. At 10^-5 seconds the universe went through a rapid period of inflation. After that, at 0.1 seconds electrons and positrons began to form. At minutes after the big bang, protons and neutrons began to form helium and several other elements and the universe became transparent to light and emitted cosmic background radiation. And finally, after one billion years galaxies begin to form and shortly after stars, solar systems, and planets also began to form. The big bang left over cosmic background radiation. There are tiny temperature fluctuations in the otherwise smooth cosmic background radiation represent the gravitational seeds in the early universe around which galaxies and galaxy clusters ultimately formed.


Red denotes hotter fluctuations and blue denote cooler fluctuations around the average. These fluctuations are extremely small, representing deviations from the average of only about 1/100,000 of the average temperature of the observed background radiation.


The big bang theory however, couldn’t explain everything. It couldn’t explain how all the radiation left over after the big bang was all about the same temperature. So, in 180 American physicist Alan Guth proposed the inflationary theory. His theory didn’t differ a lot from the big bang theory. The only major difference is when the universe started to expand; all the elements making up the universe would be in contact with each other so all the elements would be at the same temperature.


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Another theory is called the steady state theory which was theorized by Fred Hoyle. As its name suggests, it states that the whole universe grows in a steady state and is essentially the same from every spot in it and at every time. You may ask yourself, how can the universe have been the same from every spot? This is the same question that many scientists had. If the universe had always been the same from every spot at every time, that would mean that the universe would have no start or end since the universe is always the same. Because if this flaw the theory started to die down and basically died when the theory couldn’t explain the cosmic background radiation that is found today.


As for the future of the universe, the universe is theorized as either open or closed. If it is open, it will continue expanding and decreasing in both density and temperature, until it is so cold that no star could shim. The oscillating universe theory states that the universe will eventually contract and collapse on itself and possibly be created again with a new big bang.


To give you a better idea of these theories I’ll show them to you on the overhead.


(Explain…)


The final and less scientific theory on the creation of the universe is genesis which basically states that god had created the whole universe. God had created the universe in 7 days. On the first day, god created the heaven and the earth. The earth was filled with water, and nothing else. The earth was also dark so god created light! And god divided the light from the darkness. He called the light day and the dark night.


On the second day, god created the sky, he divided the waters that were below the sky and the waters above the sky.


On the third day, god made the waters under the sky be gathered together in one place and he created dry land. God created grass, sea bearing plants, and fruit trees.


On the fourth day, god divided day from night and created seasons, days and years. He created the sun and the moon as well he made the stars. God created life in the sea.


On the fifth day, God created land creatures. Such as cattle creeping things, and beasts.


On the sixth day God created man in his own image and gave them domination over the other creatures.


On the seventh day, the work was finished and god blessed his creations and rested on the seventh day from all his work which he had made.


This is the end of the seven day creation of the universe.


To sum up, each scientific theory has been accepted in the scientific community with the exception of the steady-state theory which was disproved. Some people think that the universe couldn’t have just been created by a mere explosion so they believe that god was involved in the universes creation. How the universe was really created no one will ever be certain.


Now is the time for you to complete your quiz! This quiz consists of 6 questions and if you get perfect, you will be very well prepared for your test.





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