With a hundred billion galaxies each with potentially a hundred billion stars there is no reason that life cannot exist outside our galaxy.
Photo from fpsoftlab.com
Why should mankind think that our planet holds the only life form that exists in the entire universe, that we are unique. I think there are aliens out there somewhere and they will find their way to earth what they do when they get here is the bit i would be worried about ( not that i will see it .)
But with probes being sent out from earth and radio waves also being sent they will kept going for ever and we might get visitors of the type that we do not want. Ones who would enslave us or totally wipe us out.
Theorists will readily tell you that the U.S. military is hiding alien corpses in the secret facility at area 51 the Nevada desert.
Photo from ufologiacba.blogspot.com
Being from a far of galaxy they may look like no being or animal we could even think of.
There are drawings of what is thought to be space ships and beings on cave walls and in historical records.
These images of two crusaders date from a 12th century manuscript ” Annales Laurissenses” (volumes/books about historical and religion events)and refer to a UFO sighting in the year 776, during the siege on Sigiburg castle, France. The Saxons besieged and surrounded the French people. They both were fighting when suddenly a group of discs (flaming shields) appeared hovering over the top of the church. It appeared to the Saxons that the French were protected by these objects and the Saxons fled.