Great galactic walls of stars, linked together by filaments reminiscent of axons and dendrites, straddle the observable universe, separated by great galactic voids which may harbor dark matter, black holes, or passageways through timespace. And, they are older than the Big Bang.
The 14 galactic walls so far discovered, range in size from 300 million light years to over a billion light years in length; each consisting of a beard of stars with strings of galaxies numbering in the hundreds (if not thousands). The observable universe (and we can only see a fraction) is crossed by at least 14 "Great Walls" of galaxies. Many of these galaxies are clustered into bands spaced about 600 millon light years apart. The problem is, it had to have taken nearly a hundred billions of years for even the smallest galactic wall to have formed. Fortunately, it is only a problem for those who believe the universe was created less than 14 billion years ago.
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