Oldmangamer_73 :
So, with the vastness of even our local area of the Milky Way and all the habitable planets we are discovering, the idea of being visited by another advanced civilization in the past is really that far fetched?
Now who is being the closed minded flat-earther here?
One of my huge issues (Especially after researching that author you referenced) is aliens dont seem that advanced.....
Sumerian tablets referencing aliens with Rocket Ships like how a rocket would have looked in the 50's? Landing planes on the nasca lines? Why would an alien need a prop driven machine that needs a landing strip, that one was in the book you linked to a while ago. Breathing apparatus big bulky "Communication Devices" it doesnt fit. The author proposes that humans were bred with them to make slaves to work in gold mines...... Makes no sense.
Aliens would be so far advanced they would never get caught. Even a 300 year difference would make them look like magicians, we would have no reference as to what we are seeing.
Now when we start thinking about the vastness of the milky way you also have to think about age. How much longer do you think we can live on this planet without a faster than light drive? 500 - 1000 maybe? So we have been producing radio waves for like 60 years so we have a 60 lightyear bubble around us where aliens could find us without any difficulty at all (Assuming they haven't abandoned radio wave tech altogether.... How many of you could play a laserdisc and that's only been 15 years).
So aliens have about a thousand year window to make contact with us over the course of 15,000,000,000 year life of the universe. Now im not saying there aren't aliens (I firmly believe they exist) its just when you break down the chances of aliens finding us are pretty low.
Has anyone ever filled out the drake equation?
N = the number of civilizations in our galaxy with which communication might be possible;
R* = the average rate of star formation per year in our galaxy
fp = the fraction of those stars that have planets
ne = the average number of planets that can potentially support life per star that has planets
fℓ = the fraction of the above that actually go on to develop life at some point
fi = the fraction of the above that actually go on to develop intelligent life
fc = the fraction of civilizations that develop a technology that releases detectable signs of their existence into space
L = the length of time for which such civilizations release detectable signals into space[4]