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[Visualization of orbiting supermassive black holes with accretion disks]

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[Music throughout]

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[Extreme gravitational lensing produces light rings around each black hole.]

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[Light deflected by roughly 90 degrees forms an edge-on image of the companion black hole, which rotates as the objects orbit.]

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[Gravitational forces and the effects of relativity distort the light rings into rotating ovals instead of perfect circles.]

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[Looking closer, multiple images of each accretion disk appear, each produced by light deflecting back and forth between the two black holes.]

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[The effects of relativity cause the black holes to appear smaller and brighter as they approach the camera…]

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[…and larger yet fainter as they recede.]

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[NASA]