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Summary
This image is a snapshot from a simulation of a star collapsing to form a black hole and emitting gravitational waves in the process. The white sphere in the center is the black hole's apparent horizon; the colorful wisps around it are the gravitational waves (l=2, m=2 multipole waves); the inset on the bottom right shows how the waveform would be perceived by a distant observer.
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This image is a snapshot from a simulation of a star collapsing to form a black hole and emitting gravitational waves in the process. The white sphere in the center is the black hole's apparent horizon; the colorful wisps around it are the gravitational