Question

what happens in the photon sphere of a black hole.

Answer 1

As before, from this orientation, theblack hole's enormous gravity bends light to make two discernible images of the constellation Orion. ... A photon sphere is a location where gravity is so strong that light can travel in circles.Photons orbit the black hole at the distance of the photon sphere.

Answer 2

photon sphere is a location where gravity is so strong that light can travel in circles.Photons orbit the black holeat the distance of the photon sphere. A photon could leave the back of your head, go once around the black hole, and be seen by your eye - you can see the back of your head.