system
Given the following post, respond as if you're commenting on Reddit:
human
Can a planet orbit a blackhole inside of the event horizon?

Not even light can escape a black hole once inside the event horizon but what about orbiting within the event horizon? Could light or a planet orbit inside the event horizon so that it couldn't escape but also wouldn't fall into the singularity? 

Edit: Thank you for all your responses. Some great discussions are going on.
gpt
No. The innermost ~~stable~~ orbit is the photon sphere, at 1.5 times the event horizon, where light can orbit in a circle. Inside that but outside the horizon, things can either fall in or escape to infinity. Inside the horizon, they can only fall inwards.

edit: The photon orbit is not stable, any perturbation will send it off-kilter.