I have been trying to get rid of my layman ways, and I did a recalculation of what I think the mass of the Eridanus Void would be if it was a black hole. I got about 7.6 x 10^27 kg, I checked a web page that say that the visable matter in the universe is 6 x 10^51 kg. http://people.cs.umass.edu/~immerman/stanford/universe.html This just from assuming that the density is 1,000 kg/m^3. That it is a "blob of water". I think it may be more accurate mass of the void, since water is not able to be contracted very well by pressure(and is used in hydraulics systems), and this force comes mainly from the electromagnetic field. The mass of the universe would then be then be almost the mass of the void the mass of the void number of times. In other words, I think it would only come to being about the square root of the mass of the universe.