dweller
@elizabeth - Your scenario reminds me of the SETI organization and their search for extra terrestrial radio signals. If a civilization is a million years ahead of you, MAYBE they use a communication protocol you don’t understand (compare analog radio to digital - ever dial a fax machine by mistake? Does the sound it makes make any sense?).
>>>>If a technically advanced civilization attempted to communicate with a much less advanced civilization it would understand that it must find a common means of communication. They would almost certainly assume that anyone listening for such signals would comprehend digital. Or they could use prime numbers or Finonocci numbers to get our attention. They could send ANY kind of signal as long as it’s not naturally occurring if they were simply trying to communicate that they exist. We could figure out where the signal was coming from with ease, just like they did in the movie Contact.