Well Alex lets just do a short journey, to one of our closest Stars, that we know has no Planets orbiting.
However if there was a live smart Alien population on a Planet there they would have to travel at the speed of light for over four years. to reach us
It just dose not seen possible to me unless Scotty and the Enterprise were close at hand.
Beam me up Scotty
I just don't believe in that stuff
Leon