The Diagram Above - (Fig 1) - A Working Definition of Terms The above diagram is an over_simplification of the spatial relationship between the cosmic and the terrestrial environments. It represents the local neighbourhood of the cosmos in relation to the terrestrial realms which life has inhabited for the last 4 billion years. It shows the definition of the terrestrial environment to be the earth/moon binary eco-system. It shows that this terrestrial nature is part of a greater nature
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“the distances between galaxies‚ or clusters of galaxies‚ are continually increasing and that therefore the universe is expanding.” (Infoplease) He proposed this after noticing that colors emitted from stars do not have the same wavelengths as one another in the red end of the color spectrum. People call these “red shifts.” People have speculated that these red shifts occur due to galaxies moving further away from our Milky Way galaxy. Hubble’s constant is how fast the galaxies move away from one another
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habitable zone. The habitable zone in a planetary system is the zone in the system where liquid water can exist on a planet’s surface and directly proportional to the energy output of the system’s star. For a planetary system to be habitable in a galaxy‚ it must be far enough away from the galactic center so that radiation levels are low enough for life to develop. Another requirement for Earth-like life to develop on other planets is mass. For example‚ if an organism from Earth were taken to Jupiter
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Universe? 2.1 The Extra-Galactic Zoo . . . . . . . . 2.2 Baryonic Composition of Galaxies . . . 2.3 Dark Matter Composition of Galaxies . 2.4 Galaxy Clusters and Superclusters . . . 2.5 The Cosmic Distance Ladder . . . . . . 2.5.1 Trigonometric Techniques . . . 2.5.2 Standard Candles . . . . . . . . 2.5.3 Cepheid Variables . . . . . . . . 2.5.4 Other Standard Candles . . . . 2.5.5 Redshifts and the Hubble Flow 2.6 Galaxy Cluster Mass . . . . . . . . . . 2.7 More on Dark Matter . . . . . . . . . . 1
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our home The big dates were February 13 and 15 of the year 1974‚ when Bruce Balick and Robert Brown worked with the baseline interferometer at the National Radio Astronomy Observatory and discovered a radio source coming from the center of the Milky Way. They named the source Sagittarius A* (Sagittarius A star) but they did not know what to make of it. This radio source was found to emit synchrotron radiation‚ which occurs when charged particles are accelerated in a curved orbit around an object
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half way from the galactic center to the edge of the galactic disk. - Earth - The solar System - Milky Way Galaxy - Local group - Local supercluster - Universe Where is the Sun in the Milky Way? -The sun is located in one of the Milky Way’s outer arms‚ about 25‚000 light years from the galactic center. - Also in the Orion Arim‚ more than half way out of the galaxy 2. How many galaxies are in our local group? - There are about 40 galaxies in our local group. Are all the galaxies in our
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the following questions thoroughly. 1. Name three forms of evidence used to support the Big Bang Theory. (9 points) 1. Recession of distant galaxies noted 100 years ago and confirmed in the 1920s 2. Cosmic microwave background discovered by accident in 1964 or 65. 3. Relative abundance of hydrogen‚ helium. lithium and boron as measured in other galaxies and even our Sun and other nearby stars is as predicted from theoretical studies based on hydrogen bomb research. 2. The speed of light
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Galaxy’s disk (fyi: Galaxy = Milky Way; galaxy = any other galaxy ) can be approximated by an exponential function. If stars dominate the mass distribution of the disk‚ we can then say that the mass distribution of the disk follows an exponential function‚ like this: Σ(r) = Σ0 e−r/h ‚ where h is just a scaling factor‚ a constant. Using this function‚ derive an analytic expression for how the orbital (circular) velocity of the stars dependence on the distance to the center of the galaxy‚ i.e.‚ Vc =
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However‚ not all planets have moons. Based upon what we learned in the astronomy course of how everything has a beginning and an ending. Our solar system got created from the cloud that was the Solar Nebula. All stars exist in island called galaxies‚ and galaxies contain old and new stars as well of clumps of dust clouds. These clouds mostly contain hydrogen and some heavier metals. However‚ any elements that is heavier than helium is considered to a metal by Astronomers. The formation of the solar
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working at Mt. Wilson‚ Hubble proved that there were other galaxies existed‚ outside the Milky Way. By taking many photographs through the 100-inch reflecting Hooker telescope he devised a classification system for the various galaxies he observed. He divided galaxies into elliptical‚spiral‚barred spirals‚ and irregular galaxies.Not only that but‚ he sorted the galaxies by shape‚brightness‚ and distance; it was then he noticed redshifts in galaxies’ light emissions were moving away from each other at a
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