system
Given the following post, respond as if you're commenting on Reddit:
human
Could you have a binary set of moons that orbit a planet together? Not 2 moons in separate orbits, but a pair or moons rotating around each other and orbiting a planet as well.
gpt
These orbits are very difficult to get. The two moons would need to be quite far from the planet, the planet would need to be far from its star (the planet would need a very large Hill Sphere, like Neptune).

In such a situation, a binary moon would be stable.

How it would form is another matter. The angular momentum needed is way out of whack.