There are many examples of public viewings of unidentified flying objects, but the media and government seems to stray from the possibility of alien activity. Photos and eyewitness accounts tend to be discounted since the vast majority of people do not believe in the possibility of extraterrestrial life.
There is very ambivalent proof, or so called proof, of the existence of Unidentified Flying Objects. The myth goes back to ancient times, actually. The writers Zechriach Sitchin and Erich Von Daniken, are the gurus of the theory of Alien Astronauts, which (according to their "evidence") must have been constant visitors to our planet during the times of the Mayans, Incas, Nazcas, Egyptians, Syrians, and even the Indians.
The book Mahabarata, over 2,000 years old, tells the tale of a war in heavens in which the people flew an object which was described as "fast and winged" called "Vimanas". These vimanas are the closes thing to a shuttle or any machine you see in a science fiction movie. In fact, when you read the first chapter of the Mahabarata, you will feel as if you were reading a Star Wars book. It is that weird.
Similarly, ancient China, even prior to the Mahabarata had recorded several fast-speed moving and hovering objects which, if rea UFOs, would have prevented the execution of a man, since the vision was so rare for the people, that they thought it was a mandate from the Gods.
In the Western World, the Nazca lines in Peru show runways, and pictures that could only be seen from the air, particularly if you were flying an airplane at high altitude. The Mayans have been thought to be descendants of some advanced race due to their mathematical, astrological, and scientific genius, and back in the East, Egyptian tombs and pyramids have been deemed way to precise to have been made by humans.
All of this does not mean that they exist, but this is evidence of the depth at which people believe in these objects. This, alone, is strong enough to be used as evidence.
In 1914, villagers in northwest France were astounded as the first aircraft began to dogfight during the first summer of World War I. No one had ever seen an airplane before; more importantly, the villagers, more accustomed to 19th century farming than 20th century warfare, had no context in which to understand what they were seeing. Only after the air battles became commonplace and shot down pilots and their broken machines had been observed on the ground did some common understanding evolve.
We live in a time of fantastic technical innovation, none more incredible than aerospace. In 1903, the first device we would understand as an airplane few; Sixty-six years later mankind stood on the Moon. Some of those French villagers who couldn't comprehend an airplane lived to see a spidery-contraption containing the first lunar astronauts fly over another world. It's interesting that it's the military that first came up with the designation of "UFO." The problem of test flying secret military aircraft is that they're up in the air -- where the uninformed may see them. If the military informed people of what they might see flying, there'd be a context to comprehend what was flying by -- but then it wouldn't be a military secret.
The organization MUFON is devoted to investigating Unidentified Flying Objects (UFOs), to Promoting scientific research on UFOs and to educating the public about UFOs. The most interesting aspect of MUFON is that is is an international organization whose members are in large part retired military officials and pilots, retired government officials, authentic and seriously credentialed scientists who have all been directly involved in investigations of UFO incidents and/or directly involved with encounters with UFOs. There are many instances in which masses of people have all witnessed events during which many UFOs appeared on a scene and behaved in such a way that defies our current understanding of physics. One case that comes readily to mind is a stadium full of people in Mexico viewing a soccer match who also then witnessed the skies above the stadium fill with UFOs. MUFON has a website and an annual joint meeting of all international branches where evidence is made public and discussed.
A U.F.O is also known as an unidentified flying object. I believe you are referencing UFO in terms of alien space craft.
For years there has been speculation, often fueled by science fiction comics, literature and movies about the possibility of other life forms in the universe. The term UFO was used originally by the military to call out things they say in the sky they did not know what they were (meaning who owned them).
There are photos (some real and some fake) that show many lights and oddly shaped images somewhat like human figures. Most of these photos are explained by natural phenomem such as reflective light. There was a man named Kenneth Arnold who claimed her saw an actually flying saucer (UFO) when he was flying his private plane. After he reported this many other flying saucer reports started to appear in papers.
So there is "proof" but whether that proof is valid or a spoof is up to you to interept.
There is absolute proof of UFO's. There have been many things that people have witnessed flying that they have been unable to identify. Problem solved
An unidentified flying object is something that cannot be classified as a known object or natural phenomenon. There are many reports or legends from antiquity in many writings and religious books about flying objects that can be related with the people's dream of flying or other civilizations' visits. There aren't any objects of this kind exposed somewhere, to sustain the stories about UFO's.
Nazca lines in Peru show runways because we want them to be runways. Why would such an advanced race need a runway? We already have VSTL technology and most of the British Air Force planes do not use outdated runway technology. There doesn't seem to be a purpose that such an advanced race of people would need glide technology to land any type of aircraft.
A UFO, or Unidentified Flying Object, is any sighted object that is generally seen in the sky which has no known correlation to anything that exists. The question of if they are real, turns to one's own individual beliefs. I do not believe in them, and anything that can only be seen from the air is hardly proof of anything other than large religious or ceremonial structures built on earth. If the Mayans were truly descendants of an advanced race, they would not have been wiped out so quickly by Coretz. I would imagine that they would be hard to defeat. As for the pyramids, you can be as precise as you want to if you have an entire slave army to help you do anything.
A U.F.O is a unknown flying object that most people think is real or not, and many have clamed to be tooken from there home into their space ship, but people think they are crazy, so it is still unknown today