If they create a device that can travel at these speeds.. What about space debris and artifacts that can cause damage to that device???
good question. being a star trek fan i always pondered this. my guess is any material or matter in the path is temporarily displaced or even destroyed by the warp bubble or shield of some kind. depending on size/mass of said objects of course. the good thing is space is mostly empty anyway so the odds may be low.
even though we likely won't see a ship able to travel at the speed of light or faster in our lifetime, watching the progress is interesting.