Cosmic Reionization

Visualization of the progress of reionization in a 1 Gpc/h volume. Ionized regions are blue and translucent, ionization fronts are red and white, and neutral regions are dark and opaque. A random sampling of 5 per cent (about 40,000) of all the halos at z = 0 are shown in yellow. Reionization is still quite inhomogeneous on these large scales, with large regions ionizing long before others. Visualization by R. Kaehler, M. Alvarez & T. Abel