how can earth be the only planet with existing life matter on it...with space being infinite, how do we know that there is'nt many other solar systems in this galaxy with no end?? Not that any of us will know for sure.
Which is no reason to assume that any extraterrestrial beings have visited this planet.
I read books by the Author Erick von Daniken 'Chariots of Gods' a very worth while read.
This almost leaves me speechless. Rather than saying anything rude, i'll say nothing at all.
I saw something unexplainable as a kid and dragged my parents and their friends outside to have a look and they could not explain what it was either.....
Classic definition of a "UFO"--something the viewer believes is an object, believes is flying, and is then and subsequently unable to explain. Which is absolutely no reason to assume that extraterrestrial beings have visited this planet.