The known universe contains trillion of galaxies with billions of stars in it. Looking at the big picture, the galaxies in universe are connected to each other by an invisible web of dark matter. Due to some clever use of gravitational lensing these threads of dark matter are now captured for the first time. A team of astronomers at the University of Waterloo in Canada has seen the unseeable using the space-bending effects of dark-matter to create a visual of their dark features by combining the catalogues of galaxy groups that act as lenses with catalogues of data on the light-sources behind them.
Source: Astronomers Have Captured The First Images of Dark Matter That Holds Galaxies Together