system
Given the following post, respond as if you're commenting on Reddit:
human
Could there be planets orbiting black holes? What effect would that have on them?
gpt
Anything can orbit a black hole. The planet would be subject to tidal forces which, depending how far the planet was from the black hole, could potentially rip it apart or simply heat it through internal stress like Jupiter's moon Io.

The main thing is that without a star, it would get rather cold, unless the black hole had an accretion disk and jet which were producing sufficient light to heat the planet.