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19. Cosmology - Cosmology Outline Our goals for this...

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Cosmology Outline Our goals for this section: To discern the large scale structure of the universe To understand the origin and fate of the universe Hopefully, to say “wow” a lot Questions?
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Large Scale Structure This just has to be done pictorially to do it any justice…
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In the last section, we talked about galaxies and galaxy clusters We said that the Milky Way is part of a cluster of about 45 galaxies called the Local Group We also talked about the Virgo cluster, which comprises about 2500 galaxies Is there anything in the universe larger than a galaxy cluster? Think about the possibilities: if galaxy clusters are the largest structures in the universe, we should expect them to be distributed randomly throughout the cosmos if galaxy clusters are NOT the largest structures, we should see patterns in their spatial distribution
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Distribution of Galaxies within about 60 Mpc. NOT a real photograph! Virgo Cluster
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The very largest cohesive structures discernable in the universe are galaxy superclusters , which are clusters of galaxy clusters Our parent supercluster is called the Virgo Supercluster As you should expect by now, the Local Group isn’t anywhere near the centre The Virgo Supercluster is about 40-50 Mpc across, and contains several tens of thousands of galaxies, totaling more than 10 15 solar masses (1 quadrillion!) What about larger scales, of 100 Mpc and larger?
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It is often said that the superclusters are the intersections of great cosmic filaments and walls , which themselves define a foam-like pattern around enormous voids To date, it looks like the walls are the largest structures in the universe Walls are not necessarily gravitationally bound, so it may be a stretch to call them “structures”…
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Modern computational capacity allows us to accurately simulate huge chunks of the universe This video zooms in on a slice through a simulation of the cosmos which is several Gpc on a side! Every tiny dot is a galaxy
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