For decades, publics question the existence of alien. They even suspect that NASA has already gain contact with outer space civilization. It is believed that NASA which is responsible for most space projects has covered any news and information about alien. As seen in most movie, they cover the news and deny the existence of alien for many purpose, and the most famous one is to avoid publics panic. Classified and top secret (and bla bla bla…) are the most heard popular words in this type of movies.
Some may just say that the movies are nothing more that fantasy. But I bet you will change you mind if u know these. For the past 50 years, there are more than 5 million alien related cases found all over the world, and out of these numbers, 100 thousand cases are unexplainable through natural or physical phenomena. Most people believe that they were done by creatures beyond human civilization.
UFO encounter case by Arnold in United Sate, the Roswell UFO case, and then projects led by US military in investigating the UFO phenomenon of Blue Book, Signal Plans, New Mexico White Desert Testing Ground Plan and other UFO research activities, creating a new era of UFO and alien research. All these evidences have indirectly proved that human has more than one previous contact with species from civilization outer space.
In fact, the tasks and responsibilities of NASA contains seeking extraterrestrial species and alien immigrants, though these sounds to fantasy (as if movie: Man in Black). For that, many scientists and even publics suspect that NASA covers up all information about alien.