An accretion disk is a flattened, circular or elliptical structure that is formed when material falls towards a strong gravitational force, such as a star or a black hole. The black hole’s complex appearance is due to the image of the accretion disk being warped by gravitational lensing into two images: one looping over the black hole and the other under it. . . #space #science #cosmos #black #Blackholefacts | Space Knowledge