At these velocities, even a spec of sand is a major hazard. And the distances covered in these shorts of journeys would pretty much guarantee a collision of tha

At these velocities, even a spec of sand is a major hazard. And the distances covered in these shorts of journeys would pretty much guarantee a collision of that sort. (Random search showed a 13mg grain of sand at .999c is equivalent to 1700 tons of TNT). Even interstellar/stellar wind would have enough molecules of gas to cause some crazy erosion/damage.