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Devac · 1961 days ago · link · · parent · post: Space fans of Hubski - Why don't moons ever have moons of their own?
My short no-maths take on it is that It's a very sensitive, dynamically unstable system. It's theoretically possible to have those but, as far as I know, none were ever observed. They could happen on short time-scales, absolutely, but it depends on so many factors that I'm not even sure if we could talk 'weeks'. The interaction between the Sun and hypothetical Moon's moon would probably fling it away, make it collide with Earth or the Moon or it would drop off to find its own orbit around the Sun. francopoli, am_Unition - you guys are better at orbital mechanics than me, and this thread is basically begging for your input.