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Million Years Ago 65 Million Years
2,114 wordsThe "Nemesis Theory" was an outgrowth of the discovery of Alvarez et al. , that the impact of a large (10 km diameter) comet or asteroid was responsible for the great mass extinction that took place 65 million years ago. Studies of the fossil record by Dave Raup and Jack Sepkoski shows that this was not an isolated event, but one of several mass extinctions that appear to occur on a regular 26 million year cycle. Their original paper analyzed marine fossil families, and was published in the Proc...
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Billion Years Ago Solar System
2,233 words... alvarez's case, and see if it was flawed. This job was turning out to be more fun than I had expected. On my second reading of Alvarez's letter, I found it particularly dubious that the Cretaceous and Eocene extinctions should be excluded. How do we know that asteroids do not hit the Earth periodically? I asked. Maybe our failure to arrive at a theory just meant that we hadn't been clever enough. Not finding something is not the same as proving it is not there. I decided to reserve judgment....
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Billion Years Ago Carbon Dioxide
1,230 wordsOur understanding and our modern perception of our solar system, the Milky Way, has been drastically reshaped from the corresponding perception of only a few hundred years ago. Our Solar System, the Milky Way is probably about 4 - 5 billion years old. Only in the last 400 years or so have we realized that the earth is not the "center", and that in the Universe alone there is an immense 200 billion "Suns" in a galaxy like our own. Although the origin of the solar system is uncertain, most scienti...
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Planet From The Sun Carbon Dioxide
2,115 wordsWhat are planets? Planets are kinda like asteroid around the sun. There are nine planets in the solar system, Mercury, Venus, Earth (Our planet), Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. The Terrestrial Planets The terrestrial planets are the four innermost planets in the solar system, Mercury, Venus, Earth and Mars. They are called terrestrial because they have a compact, rocky surface like the Earth's. The planets, Venus, Earth, and Mars have significant atmospheres while Mercury has...
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Space And Time Intelligent Life
1,052 wordsThe scientific community is largely in agreement on the fact that life began here on Earth about three and a half billion years ago. In a universe ruled over largely by entropy, it is inane to say that any set of circumstances could be completely unique. The primordial constituents of Earths atmosphere gave way to the building blocks of life, as could and in all likelihood has happened elsewhere in the vastness of space and time. Since the dawn of mankind, we have looked to the stars in search o...
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Gas And Dust Nuclear Fusion
991 wordsAn Introduction to World History. "Any scientist, I think, will agree that in a hundred years time, many of the details of the story we tell now may look kind of cute and naive, because well have moved on beyond them. But if you happen to live now, " he concludes, "this is the best story going. " said David Christians and it is really true. We lived in a beautiful world but dont know a lot about cosmology, geology, archeology, and population and environmental studies. Today with the help of Davi...
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Recovering Lost Atoms Of Cosmos
1,430 wordsRecovering Lost Atoms Of Cosmos I would like to talk about the history of our Universe and subjects, which concerns this topic. First of all I would like to summarize the article about recovering lost atoms of cosmos. I chose this article because it introduces the topic in interesting and exciting way. It also clarifies many points and gives a good brainstorm. The specific chemistry, which is used here, is another peace of work. I will stop on chemistry later for better specification. It was a c...
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Mars And Pluto Cannot Support Life Why
670 wordsMars and Pluto Cannot Support Life: Why? Throughout the history of the Earth, people have wondered if there is life anywhere else in the universe. For centuries, they believed that the world was flat and that the sun went around the Earth. People did not know enough about the universe to Even nowadays, there are people who believe in aliens. But science has shown us why there is no other planet, at least no such planet that we know about, that is capable of supporting life. If we take our own so...
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Man Has Evolved Four And A Half
1,303 wordsTimes Oldest Debate Raffikki Period 2 According to recent studies, planet earth formed approximately four and a half billion years ago. Since then, the earth has undergone many evolutionary changes. Earth began as a swirling gas which condensed to create an immense land mass. The ancient earth was basically the same as todays earth except for the environment. The atmosphere of the ancient earth was quite different, containing more carbon and nitrogen gases than oxygen. The former atmosphere is w...
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Planet From The Sun Center Of The Universe
2,375 wordsAssignment 1: The Solar System The solar system consists of the Sun; the nine planets, 67 satellites of the planets and a large number of small bodies (comets and asteroids). The inner solar system contains the Sun, Mercury, Venus, Earth and Mars: The planets of the outer solar system are Jupiter, Saturn, Uranus, Neptune and Pluto: The orbits of the planets are ellipses with the Sun at one focus, though all except Mercury and Pluto are very nearly circular. The orbits of the planets are all more...
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Charles Darwin Nineteenth Century
990 wordsIn the Beginning The theory of evolution, formalized by Charles Darwin, is as much theory as is the theory of gravity, or the theory of relativity. Evolutionary theory is a scientific theory dealing with scientific data, not a system of metaphysical beliefs or a religion (Wilkins). Biological theories, and especially evolution, unlike the theories of physics, have been argued long and hard in social and political arenas. Even today, evolution is often not taught in primary schools. However, evol...
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Billion Years Ago Life On Mars
1,736 wordsIf there was a wet climate on Mars in the past, as the channels imply, perhaps there was lifeform as well; could life, in some form, remain in the martian soil today? The time has come for America to commit itself to a bold new venture in space: the human exploration and settlement of Mars. Were ready. (Zubrin) Robert Zubrin, a reporter for USA Today, made that bold statement in April of this year. His article goes on to defend the human adventure to Mars why we should do it, how to do it. But o...
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Billion Years Ago Million Years Ago
605 wordsMass Extinction in the Precambrian As the decades pass, technological advances have enabled researchers, entrepenures and pondering minds the ability to discover more and more about every aspect of our very existence. Over the past three decades the evolutionary tree of life has been expanded at least seven times over. Major advances have been made in the area of evolution to open the eyes of many to the extensive history of the earth. For the very first time, we have tangible knowledge that lif...
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Harper Amp Row York Houghton Mifflin
1,327 wordsOn a clear night, only a few hundred stars can be seen without the use of any astronomical instruments. The Milky Way Galaxy consists of at least 200 billion stars. Stars are huge balls of hot gases. The sun is a star, but it is not the largest star; it is only the nearest star. A star has three recognizable stages: its birth; the years in which it exists; and its death. Its formation and its life expectancy have captured the curiosity of astronomers for centuries. Astronomers from the past have...
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Billion Years Ago Life On Mars
760 wordsMars: Is There Life Out There? Since 1976, when the Viking Landers took off toward the red planet, people have been wondering if there is life on Mars. There have been questions of pictures taken from Mars and skepticism about why some of the recent landings have failed. Scientists, up till now, have been doubtful about life on Mars. Everything changed on August 7, 1996, when NASA and President Clinton told the world that a very primitive life form had been found in a meteorite, from 1984. Presi...
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Miles Per Hour Gravitational Pull
724 wordsKristy Pryzmont May 5 th, 2001 Astronomy HWK # 4 ASTR 220 1. There is evidence that supports the hypothesis that the Milky Way Galaxy has a massive black hole at its core. At the center of our very own galaxy is a mysterious source of energy. Vast amounts of radiation pour from this compact source which may be a Supermassive Black Hole. Astronomers found an intense radio source with strings of other radio sources clustered about it in the direction of the galactic center. The intense source was ...
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Planet From The Sun Outer Planets
2,417 wordsThe Solar System consists of the Sun, the nine planets and their satellites; the comets, asteroids, meteoroids, and interplanetary dust and gas. It is composed of two systems, the inner solar system and the outer solar system. The inner solar system contains the Sun, Mercury, Venus, Earth and Mars. The outer solar system contains Jupiter, Saturn, Uranus, Neptune and Pluto. The inner planets are relatively small and made primarily of rock and iron. The asteroids orbit the sun in a belt beyond the...
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Darwin Theory Earth Surface
2,710 wordsEvolution, a process of change through time, is what links together the enormous diversity of the living world. A lot of evidence is present that indicates that the earth has had a very long history and that all living things arose in the course of that history from earlier, more simpler forms. In other words, all species have descended from other species and all living things share common ancestors in the past. Basically, organisms are what they are because of their history. Today there are man...
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Billion Years Ago Development Of Nuclear
973 wordsTable of contents Page 1: The development of nuclear energy. Page 2: What is nuclear winter. Page 3 &# 038; 4: Effects of nuclear weapons. Page 5 &# 038; 6: parts of a nuclear reactor. The development of nuclear energy In 1972, scientists discovered a natural chain reaction had occurred nearly 2 billion years ago in a uranium deposit in the west-central part of Africa. Two billion years ago, radioactive decay had not progressed so far a sit has today because of this, he are contained enough U- 2...
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Ultraviolet Radiation Carbon Dioxide
1,154 wordsHorace and the Atmosphere Hey there! I don? t know who? s reading this, but have I got a story to tell you! My name is Horace and I? m a 5 billion-year-old rock. Now wait a minute! I know what you? re thinking, ? What a boring life. What does a rock know about anything? ? But don? t walk away yet. An old rock can know more than you think and I happen to have a pretty cool story to tell you. It? s all about the atmosphere. You know, that big mass of gases and air pressure extending over 100 kilom...
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