We live in a paradoxical era where human beings have explored every corner of the Earth, ventured into space, observe the universe down to the infinitely large, study matter down to the infinitely small. . But he has not managed to elucidate a good number of phenomena that he describes as paranormal. These are, for example, UFOs, crop circles, but also spiritualism, haunting phenomena, orbs, disappearances of objects, etc. These phenomena, known for a very long time, remain unexplained by science. The general opinion is to see in some of them an extraterrestrial origin, but this hypothesis has never been proven.