thanks alot that's what i was thinking ill implement a particle center point and make all system children of it.
i"m mostly using bullet physic in double precision mode to manage my world so floating point error were only apearing on the renderer because it's only 32bits and thus i implemented the scrolling world hack around to fix the issue and for now it's working fine but maybe later i will be forced to make each planet generate it's own physic world to allow for walking on them or if using a double precision world with scrolling hack is gonna be enough. bull ill figure it later.
I will post in the showcase section probably when i'm gonna do an other video as until now i was not really using spark even if it was integrated and i don't have (yet alot of particle effect)
but if you are interested to look at my actual devlopement take a looka t my blog
http://granyte.blogspot.com/