The Universe and Our Galaxies The Universe and Our Galaxies Examples of Elliptical (Messier 87 ) and Spiral Galaxies (NGC 3559) Examples of Elliptical (Messier 87 ) and Spiral Galaxies (NGC 3559) Edwin Hubble was one of the first people to actually realise what a galaxy is‚ the measurement of the “Hubble Tuning Fork” Classification scheme shows how round or rightly wound their “arms” are. E0 means that an elliptical galaxy is extremely round‚ whilst E7 is flat. However not all galaxies
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History of the Atomic Model Just as we once believed that the earth was flat‚ our understanding of the atom was once extremely limited. As time passes‚ we begin to discover more and more about the world we live in. We have come to know much about the atom over the past two hundred years through the work of numerous brilliant scientists. Throughout history‚ scientists have come up with many experiments and atomic models to explain the atoms all around us‚ all leading up to our modern understanding
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Chemistry 3 November 2012 Historical Development of Atomic Structure Over the many years of the world’s history‚ there have been numerous developments and discoveries pertaining to atomic structure. Each of these breakthroughs gradually led us—step by step—to a deeper understanding of what makes up each and every atom. Because of this‚ our perception of an atom’s structure today is vastly different from the first idea of an atom’s structure from many centuries ago. From Dalton’s theory that
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Models of the Atom: a Historical Perspective John Dalton Early Greek Theories • 400 B.C. - Democritus thought matter could not be divided indefinitely. • This led to the idea of atoms in a void. fire Democritus • 1800 -Dalton proposed a modern atomic model based on experimentation not on pure reason. All matter is made of atoms. Atoms of an element are identical. Each element has different atoms. Atoms of different elements combine in constant ratios to form compounds. • Atoms are rearranged
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transportation systems research are suggested below. Stage 1.Identification of objectives and functioning of the subject of research‚ defining the criterion of system’s efficiency. Stage 2.Defining the borders of the system. Stage 3.Identification of the structure of environment. Stage 4.Research of the structure of transportation system; identification of its elements. Stage 5.Investigation of the characteristic interrelations between the elements of the system; design of the mathematic model of the system’s
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UB313‚ Eris or Xena [pic]Discovery images of the dwarf planet Eris. The three images were taken 1 1/2 hours apart on the night of October 21st‚ 2003. Eris can be seen very slowly moving across the sky over the course of 3 hours. Eris was discovered in July‚ 2005 by Mike Brown of CalTech and his team. Eris was originally named Xena or UB313 but re-named Eris by the IAU (International Astronomical Union). On 10th September 2005‚ astronomers at the Keck Observatory took a look at Eris with a new
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gravity pulls down more on the sand paper because it has more mass. Date and Observation: My experiment did in fact support my hypothesis. Because I knew the paper towal was in fact lighter than the sand paper it help me see that it was in fact which one is more suited to fall first. The forces acting on the objects while dropped was gravity. The forces acting on the objects getting vacuum is pulling. The acceleration rate of the objects on Earth versus
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The Rutherford Model of the Atom 1. In 1911 Rutherford proposed the nuclear model of atomic structure. He suggested that an atom consists of a central nucleus (where most of the mass of the atom is concentrated) having a positive charge‚ surrounded by moving electrons carrying negative charge. Geiger and Marsden carried out an experiment to verify his proposal. The Geiger/Marsden a Particle Scattering Experiment 1. The apparatus is illustrated in the diagram below. | 2. The apparatus
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small atoms that can easily slip past each other. 350 BC Aristotle did not believe in the atomic theory and he taught so otherwise. He thought that all materials on Earth were not made of atoms‚ but of the four elements‚ Earth‚ Fire‚ Water‚ and Air. He believed all substances were made of small amounts of these four elements of matter. He did not conduct experiments or use scientific method for atomic theory. . 1800 AD It was John Dalton who determined that each chemical element is composed
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The Progress of the Atomic structure Different theories about the atomic structure were introduced over time. These theories changed as a result of development of different experiments. Leucippus was the first to introduce the theory of atomism‚ however he didn’t write about his theories in detail. However‚ Democritus‚ his student wrote about the theory of atoms in detail. He theorised that everything was composed of atoms and that atoms are solid and indestructible. He also had a theory that
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