COSMIC STRUCTURE by Govert Schilling Untangling the Cosmic Web THE WEB Based on survey data and simulations, this reconstructed image shows the structure of the Perseus-Pisces supercluster of galaxies (central strand). Colors indicate distance from the Milky Way: Red is closer (about 130 million light-years), blue farther (230 million light-years). Black stripes are filaments, while colored polygons are walls. 34 JANUARY 2022 * SKY & TELESCOPE