If you begin to find the alien by using common sense, then you have just narrowed your searching area.

There is no UFO and also there is no alien,
at least not in common mind nor reference.

If you want to find wilier race by common sense,
then you have just narrowed your searching area.

If you want to be sure of unusual thing such as aliens or UFOs,
then you have to think about it from an unusual way of thinking.

When we do stargazing, we stare at the stars...and many other things which we have presumed commonly as stars.

If you don't believe what I tell you, then what can I say. I've no rights to coerce others. If you don't believe it from people you trust, then you have to prove it by yourself. If you don't believe your own senses and mind, then you may have to revise the way you believe in something yet alien and unknown.