The Doubly Warped World of Binary Black Holes | NASA Goddard
If one black hole looks strange, what about two? Light rays from accretion disks around a pair of orbiting supermassive black holes make their way through the warped space-time produced by extreme gravity in this detailed computer visualization. The simulated accretion disks have been given different false color schemes, red for the disk surrounding a 200-million-solar-mass black hole, and blue for the disk surrounding a 100-million-solar-mass black hole. For these masses, though, both accretion disks would actually emit most of their light in the ultraviolet. The video allows us to see both sides of each black hole at the same time. Red and blue light originating from both black holes can be seen in the innermost ring of light, called the photon sphere, near their event horizons. In the past decade, gravitational waves from black hole collisions have actually been detected, although the coalescence of supermassive black holes remains undiscovered.
Viewed from near the orbital plane, each accretion disk takes on a characteristic warped look. But as one passes in front of the other, the gravity of the foreground black hole transforms its partner into a rapidly changing sequence of arcs. These distortions play out as light from the accretion disks navigates the tangled fabric of space and time near the black holes.
The simulated binary contains two supermassive black holes, a larger one with 200 million solar masses and a smaller companion weighing half as much. Astronomers think this kind of black hole system is one in which both members could maintain a long-lived accretion disk.
The disks have different colors, red and blue, to make it easier to track the light sources, but the choice also reflects reality. Gas orbiting lower-mass black holes experiences stronger effects that produce higher temperatures. For these masses, both accretion disks would actually emit most of their light in the UV, with the blue disk reaching a slightly higher temperature.
Visualizations like this help scientists picture the fascinating consequences of extreme gravity’s funhouse mirror.
Seen nearly edgewise, the accretion disks look noticeably brighter on one side. Gravitational distortion alters the paths of light coming from different parts of the disks, producing the warped image. The rapid motion of gas near the black hole modifies the disk’s luminosity through a phenomenon called Doppler boosting an effect of Einstein’s relativity theory that brightens the side rotating toward the viewer and dims the side spinning away.
The movie also shows a more subtle phenomenon called relativistic aberration. The black holes appear smaller as they approach the viewer and larger when moving away.
These effects disappear when viewing the system from above, but new features emerge. Both black holes produce small images of their partners that circle around them each orbit. Looking closely, it is clear that these images are actually edge-on views. To produce them, light from the black holes must be redirected by 90 degrees, which means we’re observing the black holes from two different perspectives—face on and edge on—at the same time. Zooming into each black hole reveals multiple, increasingly distorted images of its partner.
The visualization, created by Goddard astrophysicist Jeremy Schnittman, involved computing the path taken by light rays from the accretion disks as they made their way through the warped space-time around the black holes. On a modern desktop computer, the calculations needed to make the movie frames would have taken about a decade. So Schnittman teamed up with Goddard data scientist Brian P. Powell to use the Discover supercomputer at the NASA Center for Climate Simulation. Using just 2% of Discover’s 129,000 processors, these computations took about a day.
Astronomers expect that, one day, they will be able to detect gravitational waves—ripples in space-time —produced when two supermassive black holes in a system much like the one Schnittman depicted spiral together and merge.
Learn more: https://www.nasa.gov/universe/new-nasa-visualization-probes-the-light-bending-dance-of-binary-black-holes/
Video Credit: NASA’s Goddard Space Flight Center/Jeremy Schnittman and Brian P. Powell
Scott Wiessinger (USRA): Producer
Jeremy Schnittman (NASA/GSFC): Lead Visualizer
Brian Powell (NASA/GSFC): Visualizer
Francis Reddy (University of Maryland College Park): Science Writer
Duration: 3 minutes
Originally Produced: April 15, 2021
Release Date: May 6, 2025
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