Feb_21 - The Biggest Things in The Biggest Things in the...

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Unformatted text preview: The Biggest Things in The Biggest Things in the Universe the Universe Thursday, February 21 Thursday, February 21 Large scale structure of the universe Large scale structure of the universe = how galaxies and clusters of galaxies are distributed through space. To visualize large scale structure, we need a map map of the universe. Making maps isn’t easy. Early maps of the Earth were faulty because of lack of information . Making maps isn’t easy. You must select what information goes on your map. Making maps isn’t easy. If the information you want isn’t available, you must use an imperfect substitute . Ideally, we would like to know how all all the energy & mass is distributed through space. This is difficult (and perhaps useless). “…the Cartographers Guild drew a Map of the Empire whose size was that of the Empire, coinciding point for point with it. The following Generations, who were not so fond of the Study of Cartography, saw the vast Map to be Useless and permitted it to decay and fray under the Sun and winters.” – Jorge Luis Borges Although dark energy & dark matter make up most of the universe, they’re invisible ....
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This note was uploaded on 07/17/2008 for the course ASTRO 294 taught by Professor Ryden during the Winter '08 term at Ohio State.

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Feb_21 - The Biggest Things in The Biggest Things in the...

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