"Flying Discs of Unknown Identity Flying Objects" UFOs. No matter how you call them, their history is much older, perhaps even older than humans. There are many direct and indirect indications that beings from other planets have repeatedly visited Earth, possibly for millions of years and still continue to do so. Whether one believes it or not, they have no right to question the evidence. The skepticism shown by the scientific and non-scientific community, in the early theories about extraterrestrial life forms visiting our planet, was not so much due to lack of evidence and proof, but to the psychological tendency of humans to place themselves at the center of the Universe. However, burying one's head in the sand has never solved any problem, and no one has ever found the truth by closing their eyes.