Also, who's to say that life on other planets hasn't already come and gone? Universe is about 13 billion years old, give or take a week. Earth has been around 4-1/2 billion years. Man has been around only for a couple of million years of that, and recorded history only goes back a few thousand. That's an awfully small window for another civilization to hit.
Or is yet to come?
I’ve had the same thought — what are the chances of them arriving here during the extremely small time window that advanced humans have existed, i.e., the immediately passed 4 or 5 thousand years? Maybe they stop by every million years to check in on earth.
I would add: We, as a species didn't even radiate coherent information until Hertz, Tesla and Marconi gave us the radio in the very late 1800's.
You obviously weren’t a fellow participant in the recent thread on the age of the earth.
Not being argumentative, just stating that there are those here who find your statement blasphemous and I lump them in with the level of intellect of those prosecuting “climate deniers”...without regard to their ignorance re the hypocrisy.