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Submillimeter VLBI (VLBI)

Visualizing ray around a Kerr black hole
Image Credit: Hung-Yi Pu
Visualizing ray around a Kerr black hole
"Odyssey_Edu" is an educational software is developed for visualizing the ray around a Kerr black hole (available at
The above image (created by Odyssey_Edu) demonstrates the effect of the frame-dragging, an effect caused by the rotation of spacetime around a Kerr black hole! Due to this effect, light rays must co-rotate in the same direction that black hole rotates when they are in the ergosphere (the outer white oblate surface represent the static limit: the outer edge of the ergosphere).
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