> At first thought a moon of a moon didn’t seem to be possible as the gravity of the moon’s planet would certainly make an orbit around a moon unstable.
No, that's not true. Moons can have moons with stable orbits. Not every moon can, though.
If you think about it, the Moon already orbits Earth which orbits Sun.
Our Moon could have satellites but the issue is that it is lumpy. It is not uniform in density and this causes huge gravitational anomalies which prevent long term stable orbits. If Moon was uniform it could have stable orbits.
No, that's not true. Moons can have moons with stable orbits. Not every moon can, though.
If you think about it, the Moon already orbits Earth which orbits Sun.
Our Moon could have satellites but the issue is that it is lumpy. It is not uniform in density and this causes huge gravitational anomalies which prevent long term stable orbits. If Moon was uniform it could have stable orbits.