These just came up in my ninth game, and I don't think they've been asked here yet:
1. Can you go up more than one Ascendancy Level per turn? (Yes?)
2. Can you float a planet physically through another planet, whether that second planet is floating or fixed? (No?)
1. Yes, you may purchase any number of ascendancy tokens during your build phase. Just gotta pay for them.
2. No, when sliding a floating system, you may not overlap any other system or space lane, and you cannot lift the floating system while moving it.