Are there aliens?you know?I do not know.And we all do not know.we only found some strangers by seeing the film,except that ,we know nothing about aliens.Maybe ,in the world,or in the universe,there no aliens at all.so called aliens ,only be imaged out by someone who is upset to the other world.And then more and more people feel unsafe ,and then the aliens,really existed,of cause only in someone's mind.