Light travels at a staggering 670-million miles per hour (1.07-million kilometres per hour) Radio Waves and all other electromagnetic waves also travel at the speed of Light. On November 11, 1866 propagation of an electromagnetic wave was observed for the first time by Heinrich Hertz - So if one of the many madmen ruling the world right now were to blow us up other more intelligent life forms would be able to listen in on at least a century and a half's worth of our vibrant yet short existence.......if they were at all interested. #wowsignal 🌍🌏🌎📡👽
