How dark is the cosmic web?

A visualization of the filaments in the cosmic web. Simulation produced by the EAGLE project. (Image: © EAGLE Project)

"The universe is permeated by a vast, invisible web, its tendrils weaving through space. But despite organizing the matter we see in space, this dark web is invisible. That's because it is made up of dark matter, which exerts a gravitational pull but emits no light. That is, the web was invisible until now ..." (read more)