> If humans were to advertise our own presence to possible species living tens of billions of light years away, how would we go about doing it? We‘ve been tryi

> If humans were to advertise our own presence to possible species living tens of billions of light years away, how would we go about doing it? We‘ve been trying: https://en.m.wikipedia.org/wiki/List_of_interstellar_radio_messages https://en.m.wikipedia.org/wiki/List_of_interstellar_radio_m...