The article is dated 2007, and much more has been learned about the WMAP cold spot in the past almost fifteen years. Tracing out how the very earliest structur

The article is dated 2007, and much more has been learned about the WMAP cold spot in the past almost fifteen years. Tracing out how the very earliest structures in the CMB compare with much more recent galaxy filaments (and the voids between the dense filaments) is an interesting area of research, and there will be open questions for many years to come as galaxy surveys at different redshifts produce observational data. (All the galaxies will be at a lower redshift than the CMB cold spot, and it is a good guess that the CMB cold spot reflects an arrangement of matter much closer to the hot big bang or cosmic inflation than that. Perhaps one day our descendants will be able to examine the cosmic neutrino background to see if it too has a comparable cold spot, and the same with primordial gravitational radiation; alternatively perhaps they will discover that later-time physics distorted the CMB very slightly. The latter hypotheses are in practice much easier to test with observational data, and of course one can exploit the many unknowns in the dark matter and dark energy sectors without colliding with constraints from known physics.) https://en.wikipedia.org/wiki/CMB_cold_spot https://en.wikipedia.org/wiki/CMB_cold_spot