Blacraft Forum

"In figure 8.4, we see clumps of galaxies around 13h 20m at z = 0.05, 0.08, 0.11 and 0.15. These are quite clear in the left wedge of figure 8.5, but much weaker in the right wedge. Similarly, the void at 12h and z = 0.08 is emptier in the left wedge - why? The left-wing galaxies are red elliptical and S0 systems, while on the right are spirals and irregulars. As we saw in section 7.2, elliptical galaxies live communally in the cores of rich clusters, where spiral galaxies are rare. Accordingly, the clustering of the red galaxies is stronger than that of the bluer systems of the right panel. Whether galaxies are spiral or elliptical is clearly related to how closely packed they are: we see a morphology-density relation."

Tl;dr - elliptical galaxies are communist living together sharing their gas and dark matter, and spirals are evil capitalist. Numerous red stars are the proletariat and the few, luminous blue stars are the evil bourgeoisie trying to outshine the rest and get all the attention. But they die off quickly while the red stars live on. The universe is communist.