system
Given the following post, respond as if you're commenting on Reddit:
human
Can light orbit an object?

To clarify, is it possible for light to approach an object in space in such a way that it will enter a stable orbit and not eventually pass an event horizon, such as in the case of a black hole, instead it will continue forever in a circular orbit.
gpt
Light can orbit a black hole at a distance of 1.5 times its event horizon radius; this is called the photon sphere. For rotating black holes the shape is more complicated. However, these orbits are unstable: a small perturbation to the orbit sends them off to infinity or into the black hole.