You might feel differently if you knew what it was.
Surely, if they have the tech know-how to traverse the galaxy or universe, they could crack our language code, as it were.
Also, assuming it is real, how do you rule-out the possibility that it is a demonic, rather than extra-terrestial phenom? Particularly in light of the fact that it has a quasi-religious aspect.
How do you know your not being decieved?
Brian.