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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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North South East West
789 wordsA satellite is any object that orbits or revolves around another object. For example, the Moon is a satellite of Earth, and Earth is a satellite of the Sun. The payload is all the equipment a satellite needs to do its job. This can include antennas, cameras, radar, and electronics. The payload is different for every satellite. For example, the payload for a weather satellite includes cameras to take pictures of cloud formations, while the payload for a communications satellite includes large ant...
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Southern Hemisphere Magnetic Field
1,422 wordsJupiter, the largest of the Jovian planets, reigns supreme throughout the solar system. Named after the Roman god Jove, the ruler of Olympus; "Jupiter is the fifth planet from the sun and is also the largest planet in the Earth's solar system. It is 318 times more massive than Earth and is two thirds of the planetary mass in the solar system. Jupiter's surface, unlike earth, is gaseous and not a solid. It is about 90 % hydrogen and 10 % helium with traces of methane, ammonia, water and rock. Jup...
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Scientific Revolution Heavenly Bodies
2,191 words... ientific Revolution brought many new ideas and beliefs not only to Europe but the entire world. The most widely influential was an epistemological transformation that we call the "Scientific Revolution. " In the popular mind, we associate this revolution with natural science and technological change, but the scientific revolution was, in reality, a series of changes in the structure of European thought itself: systematic doubt, empirical and sensory verification, the abstraction of human kno...
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Dust Particles Magnetic Fields
2,093 words... planet from the Sun and is the third largest in the solar system. It has an equatorial diameter of 51, 800 kilometers (32, 190 miles) and orbits the Sun once every 84. 01 Earth years. It has a mean distance from the Sun of 2. 87 billion kilometers (1. 78 billion miles). The length of a day on Uranus is 17 hours 14 minutes. Uranus has at least 22 moons. The atmosphere of Uranus is composed of 83 % hydrogen, 15 % helium, 2 % methane and small amounts of acetylene and other hydrocarbons. Methan...
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Nuclear Arms Race World War Ii
2,499 words1960 - 1970 Table Of Contents Womens Movement I. Gloria Steinem pages 1 - 4 Cold War I. Life into Orbit pages 5 - 7 II. Arms Race pages 8 - 12 III. Berlin Wall pages 12 - 20 Bibliography pages 21 - 22 Gloria Steinem Gloria Steinem is heroine. When she was little, Gloria lived with her crazy mother. Gloria went to graduate from Smith College, and then she moved to India to study. While she was in India, she realizes just how much females were discriminated against. In India it was much worse than...
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Thousand Six Hundred Planet From The Sun
1,448 wordsOn a hot summer night, as you are sitting outside enjoying the evening, you tilt your head back and look into the night sky. You begin to wonder what is really out there? How far away are the stars? Are they stars or are they planets? We live in a part of the night sky called the Milky Way Galaxy. Our galaxy can be seen with the naked eye on a clear summer night. It resembles a ribbon stretched across the night sky. During the summer is when the Milky Way is at its fullest with the stars so clus...
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Solar Panels Solar Cells
993 wordsSatellites Satellite is probably the most useful invention since the wheel. Satellites have the capability to let you talk with someone across the nation or let you close a business deal through video communication. Almost everything today is heading towards the use of satellites, such as telephones. At&# 038; t has used this communications satellite (top right) ever since the late 1950 s. TVS and radios are also turning to the use of satellites. RCA and Sony have released satellite dishes for R...
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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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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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Division Multiple Access Earths Surface
4,071 wordsIncreasing demand for high-speed reliable network transmission has motivated the design and implementation of new technologies capable of meeting lofty performance standards. A relatively new form of network transmission known as Asynchronous Transfer Mode (ATM) has emerged as a potential technological solution to the ever-increasing bandwidth demand imposed upon networks. ATM technology can be a good choice of network medium for many transmission tasks such as voice, data, video, and multimedia...
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Angular Momentum Los Alamos
1,597 wordsTheories of The Origin of the Moon The Moon is the only natural satellite of Earth. The distance from Earth is about 384, 400 km with a diameter of 3476 km and a mass of 7. 35 1022 kg. Through history it has had many names: Called Luna by the Romans, Selene and Artemis by the Greeks. And of course, has been known through prehistoric times. It is the second brightest object in the sky after the Sun. Due to its size and composition, the Moon is sometimes classified as a terrestrial planet along wi...
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Space Exploration Space Race
1,360 wordsSpace exploration is a big part of American history and has been shrouded with controversy for years and years. Space exploration is defined as the investigation of physical conditions in space and on stars, planets, and their moons through the use of artificial satellites, space probes, and spacecraft with human crews (Whitehouse). From the space race with Russia to unmanned lunar probes, space exploration inspires and enlightens every person that comes in contact with it. One example of an ins...
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