Even matter ejected by black holes can run into objects in the dark. Using NASA's Chandra X-ray Observatory ... medium-energy X-rays in purple, and the highest-energy X-rays in blue.
The Perseus Cluster and its central supermassive black hole in white as seen by the Chandra telescope and the VLT | Credit: X-ray: NASA/CXC/SAO/V. Olivares et al.; Optical/IR: DSS; H-alpha ...