I read an interesting article called So much space, so little time: why aliens haven’t found us yet. Dutch researcher, Rasmus Bjork, says that the universe is so vast that aliens don’t have time to seek us out.

. . . even if the alien ships could hurtle through space at a tenth of the speed of light, or 30,000km a second, - Nasa’s current Cassini mission to Saturn is plodding along at 32km a second - it would take 10bn years, roughly half the age of the universe, to explore just 4% of the galaxy.

That makes perfect sense, where our technology is concerned. However, I find it a big coincidence how far we’ve evolved technologically since the Roswell incident back in the 40’s. Then there are the stories of people from all over the world and all walks of life, giving almost identical descriptions of aliens who kidnapped them during the era where science fiction wasn’t so influential. As far as I know, no one has been able to explain away what happened to those people.