Okely Dokely. Now we're going to get the moons animating on paths in staggered times just like we've done with the planets.
See if you can go through the moons just like you did with the planets, and assign path controllers to their various orbits. Once you've done that, go through and adjust their end times (shifting the end keyframe).
Here are some end key times for you to use.
Planet 3, moon - end 25
Planet 4, moon1 - end 25
Planet 4, moon2 - end 40
Planet 5, moon1 - end 40
Planet 5, moon2 - end 55
Planet 5, moon2a - end 30
To save you time (this is a lot like a cooking program, eh?) I've baked it up for you.
Feel free to load Solar System 4.MAX and continue.