Yes. I agree. I don't think there is really empty space
  inbetween thing - we just don't have the equipment to detect it
  yet. I think that "goo" is EXTREMELY easy to move through - it's
  just hiding. I think a sub-Kelvin barrier around your vehicle
  with just the tiniest of gaps for flow, would give the
  propulsion needed to propel an object of any size faster than
  the speed of light, because you'll then be invoking what some
  might call "anti-gravity" or "dark energy" or "mysterious
  forces" but really, they'd just forces that we don't normally
  see because, well, they're travelling faster than the light it
  takes to get to us and so it never reaches us our eyes or
  equipment. "