Map of the Huge-LQG showing only the group members expanded to spheres 66 Mpc in diameter (Image: University of Central Lancashire)
The X-ray image of the quasar PKS 1127-145, a highly luminous source of X-rays and visible light about 10 billion light years from Earth, shows an enormous X-ray jet that extends at least a million light years from the quasar (Photo: NASA)
The same region of space shown in Clowes' map of the Huge-LQG, with all the quasars appearing (not just those identified as belonging to the Huge-LQG) as point-like objects – no clustering is apparent (Image: Seshadri Nadathur)
The Universe is big, and so is the challenge of understanding its large-scale structure (Photo: Hubble Ultra Deep Field / NASA; ESA; G. Illingworth, D. Magee, and P. Oesch, University of California, Santa Cruz; R. Bouwens, Leiden University; and the HUDF09 Team)
Our knowledge of the large-scale structure of the Universe is gradually taking shape. However, our improved vision is mostly being statistically squeezed from huge data sets. Working backward from a statistical analysis to a putative fact about the (singular) Universe, to which statistics do not apply on a cosmological scale, is a dicey business. A case in point is a recent look at the biggest known structures in the Universe – large quasar groups.
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