All very interesting. However if Einstein was right, no biological or mechanical entity from these planets could ever physically reach us or us them. However Earth has been transmitting huge amounts of digitized communications for the last forty years. Who knows? They may have reached a Civilization twenty or thirty light years away and return messages may be on the way.
Let’s hope he was correct. Any being smart to get here would most likely not be on a rescue mission to help.
I loved the sign in some SF gym last year: “remember, when ETs get here, they will eat the fat ones first”.
Whom will they contact? The Lone Ranger, Johnny Dollar, Mr. Keane? The Shadow? Is it possible that they have been playing "Jeopardy" for all these years?