... Too Close to a Black Hole . ... On the right is the same star field but this time with a black hole superposed in the center of the frame. ... Black holes are thought to be the densest state of matter, and there is indirect evidence for their presence in stellar binary systems and the centers of globular clusters, galaxies, and quasars. ... NASA Official: Jay Norris. ... Publications with keywords: black hole - gravitational lens . Publications with words: black hole - gravitational lens . ...