EAR105_lecture02_universe

EAR105_lecture02_universe - The Origin of the Universe and...

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Unformatted text preview: The Origin of the Universe and Earth EAR105 - Earth Sciences Syracuse University, Spring 2011 Tuesday, January 25, 2011 Outline The Universe - origin and composition The Big Bang Theory - the doppler effect and red shift The Milky Way - origin of our solar system The Earth - origin of our planet http://img.tebyan.net/library/english/8320_North%20Star0.png Tuesday, January 25, 2011 Superclusters of galaxies Void space and Dark Matter http://www.atlasoftheuniverse.com ~30 billion trillion stars in the visible universe (3X10 22 ) Text What is the Universe? Tuesday, January 25, 2011 14 billion light years away http://www.atlasoftheuniverse.com The visible universe Where is Earth? Our knowledge of the large scale structure of the universe is incomplete, many features are visible right out to the very edge of the visible universe. The entire universe is fairly uniform Tuesday, January 25, 2011 1 billion light years away http://www.atlasoftheuniverse.com Where is Earth? The Neighbouring Superclusters The distribution of galaxies in the universe is non-regular. They tend to clump together into huge supercluster formations. Shown is many of the superclusters within 1 billion light years of us. Where is Earth? Tuesday, January 25, 2011 100 million light years away http://www.atlasoftheuniverse.com Where is Earth? Local galaxies centred around the massive Virgo Cluster. Collectively, known as the Virgo Supercluster Tuesday, January 25, 2011 Where is Earth? 5 million light years away Milky Way Galaxy - gravitionally bound to 2 other spiral galaxies http://www.atlasoftheuniverse.com Tuesday, January 25, 2011 Where is Earth? http://www.atlasoftheuniverse.com 500,000 light years away The Satellite Galaxies The Milky Way is surrounded by several dwarf galaxies slowly orbiting it in periods of billions of years. This map shows the nearest of these satellite galaxies. Tuesday, January 25, 2011 Where is Earth? 50,000 light years away http://www.atlasoftheuniverse.com The Milky Way Galaxy Our galaxy is a loose spiral disc of two hundred billion stars rotating around a compact centre. Tuesday, January 25, 2011 Where is Earth? 5,000 light years away http://www.atlasoftheuniverse.com The Orion Arm The local arm of our galaxy is called the Orion Arm. It is depicted here showing the millions of stars interspersed with clouds of interstellar gas Tuesday, January 25, 2011 Where is Earth? 250 light years away http://www.atlasoftheuniverse.com The Solar Neighbourhood A large proportion of the stars visible with the naked eye are within 250 light years. This map shows this tiny section of our galaxy that surrounds our Sun. Tuesday, January 25, 2011 Where is Earth? 12.5 light years away http://www.atlasoftheuniverse.com The closest star to the Sun is only 7000 times further than the edge of our solar system. This map shows all of the stellar systems that lie within 12.5 light years from us....
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This note was uploaded on 02/17/2011 for the course EAR 105 taught by Professor Ivany during the Spring '09 term at Syracuse.

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EAR105_lecture02_universe - The Origin of the Universe and...

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