3D map of the cosmic web at a distance of 10.8 billion light years from Earth. The map was generated from imprints of hydrogen gas observed in the spectrum of 24 background galaxies, which are located behind the volume being mapped. The coloring represents the density of hydrogen gas tracing the cosmic web, with brighter colors representing higher density. Image cCREDIT: Casey Stark (UC Berkeley) and Khee-Gan Lee (MPIA) 