[Visualization of orbiting supermassive black holes with accretion disks]
[Music throughout]
[Extreme gravitational lensing produces light rings around each black hole.]
[Light deflected by roughly 90 degrees forms an edge-on image of the companion black hole, which rotates as the objects orbit.]
[Gravitational forces and the effects of relativity distort the light rings into rotating ovals instead of perfect circles.]
[Looking closer, multiple images of each accretion disk appear, each produced by light deflecting back and forth between the two black holes.]
[The effects of relativity cause the black holes to appear smaller and brighter as they approach the camera…]
[…and larger yet fainter as they recede.]
[NASA]