They were riding a space scooter obviously designed to be used to jump from asteroid/moon to asteroid/moon. Anyone with half a brain wouldn't be wondering about the minute details of how it operates, because it's obvious that it was just a space scooter designed for jumping between asteroids/moons.
Regarding midicholorians, I've never understood why people thought they were the source of the Force. The way they were talked about, it was clear that they were simply an indicator
of it; ie, they increase in number the more powerful you likely are with the Force. Not that they have anything at all to do with it whatsoever.