Simulated structure of the early universe: The Milky-Way-sized galaxies discovered by Rennan Barkana and Avi Loeb would be the bright points at the vertices of these galactic filaments. Credit: Volker Springel (Max Planck Institute for Astrophysics and Harvard-Smithsonian Center for Astrophysics) and Lars Hernquist (Harvard-Smithsonian Center for Astrophysics)

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