Cosmologists made this computer model of the universe at an age of about 2 billion years. In the simulated universe gravity causes the primordial matter to arrange itself in thin filaments, much like a spider's web. The color coding indicates the density of the gas, yellow for highest, red for medium, and blue for the lowest density. In the high density (yellow) regions the gas will undergo collapse and ignite bursts of star formation.
Max-Planck-Institute for Astrophysics: Tom Theuns