Figure 1. Galactic Filaments; Optical/UV: NASA/STScI; Radio: NSF/VLA/CfA/D.Evans et al., STFC/JBO

From

Alternative Mechanisms of Dark Matter, Galactic Filaments and the Big Crunch

Jay D. Rynbrandt

Frontiers of Astronomy, Astrophysics and Cosmology. 2016, 2(1), 35-37