Spore game question, how do I move in the last stage?

I think your problem is pretty simple, all you have to do now is to go to space. To do so you need to keep flying higher, I have the little scroller thing on my mouse that lets me go higher, if you don't have that find the on that makes you go higher and go as high as you can, eventually you will be in space . Also their is a mission on, it glows or flashes, go to that, you may not have completed all the parts of a certain mission; your ground control will take care of that for you! Hope it helps