User blog comment:PitaKang/Funday Monday 3: What would an interstellar civilization look like?/@comment-32656-20130501080354/@comment-32656-20130505045632

...You seriously need to read more about the matter. It is, in fact, quite safe to go up to about 0.5 lightspeed without those things being at all issues. As for the items themselves, that is what sensors are for. That is what NASA does now for pete's sake.