If I have heard correctly, models of the early universe predict the existence of macroscopic strings brought about by the enormous initial expansion of the universe. A way of proving string theory correct - among others - would be observing such macroscopic strings. My question lies with how one might detect such a thing. Would it emit some sort of special radiation? I do not see how that could be since it is a fundamental constituent of matter, it could not possibly be divided any further to create this radiation in question. Then would they observe it by looking for its interactions with it and other objects? If so, what would such an interaction look like? Terribly sorry if I have made any false assumptions, I am very new to this field.