Looking for Supermassive Black Hole Binaries with a Flash of Starlight

Simulation of the gravitational lensing of starlight by a binary black hole. Credit: Max Planck Institute for Gravitational Physics

Supermassive black hole binaries can be difficult to detect in many galaxies, but a new approach could find them by looking for the regular flashes of starlight caused by the gravitational lensing of these black holes.

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