An image of dark green and blue filaments against the dark backdrop of space. In between these filaments are tiny yellow dots. Overlaid on the image is a small circular diagram of the Milky Way galaxy.
A lonely Milky Way Analogue galaxy, too massive for its wall. The background image shows the distribution of dark matter (green and blue) and galaxies (here seen as tiny yellow dots) in a thin slice of the cubic volume in which we expect to find one of such rare massive galaxies.
Images: Miguel A. Aragon-Calvo. Simulation data: Illustris TNG project