Mankind has been having a one way conversation with the universe since radio waves first began leaving our planet in the late 1800's. Every radio station, every TV station, every transmitter is beaming a signal off the planet. So who's listening?
Most likely, nobody.
Even though the radio waves travel at the speed of light, that's still a small area of our Milky Way galaxy. For the waves to reach all corners of the galaxy will take another 118,000 years!
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