Travelling at any interstellar velocity seems to also be so, because even pretty tiny dust specks can take out a space ship at appreciable fractions of c. So yo

Travelling at any interstellar velocity seems to also be so, because even pretty tiny dust specks can take out a space ship at appreciable fractions of c. So you'd need extremely good radar to avoid/deflect/destroy it (and you don't have long to do so). Though I suppose at least you can conceivably hope to detect them since you can actually see them at all since the approach is subluminal.