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October 31, 2011

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The illustration at the head of this post reminds me of an illustration on this page
http://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/galaxydist.htm
with the following text:
We find that the galaxies form a soap bubble-like or "foamy" distribution in space with galaxies lying along the surfaces of the bubbles and nothing in the centers of the bubbles; these nearly empty regions are called "voids."
As you noted recently, the frequency of resemblances spanning orders of magnitude of scale is hauntingly suggestive. Can gravitational flow include force chains and jamming? It would be interesting to look for 64% concentrations in that foamy distribution.

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