Are UfO's real? For centries many people tried to answear that question, some say they are, others say that this is only people's imagination...
The average of UFO reports are 40 times PER DAY! and around 9 of them cant be explained. There are also videos and photographs of the UFO/aliens, yes some are fake, yes some can be explained but even some greatest scientists cant find an explanation to such evidence!
The first ever UFO report was made around 45,000 BC. in the Egyption hyroglithics with some strange UFO-like drawings. The latest is today! The first official investigation of the UFO took place in Japan in 1235 AD. When general Yoritsume and his army were encamped, mysterious lights were observed in the heavens. The lights were seen in the southwest for many hours, winging, circling and moving in loops. After general ordered a "full-scale scientific investigation".

The Tunguska event, sometimes referred to as the Tunguska explosion, was a massive explosion that occurred near the Podkamennaya (Under Rock) Tunguska River in what is now Krasnoyarsk Krai of Russia, between 7:00 and 8:00 AM on June 30, 1908.The explosion was most likely caused by the airburst of a large meteoroid or piece of a comet about 20 m (66 ft) in length 5 to 10 kilometers (3–6 mi) above the Earth's surface.

Natural H-bomb

In 1989, the astronomers D'Alessio and Harms suggested that some of the deuterium in a comet entering the Earth atmosphere may have undergone a nuclear fusion reaction, leaving a distinctive signature in form of carbon-14. They concluded that the release of nuclear energy may have been almost negligible. Independently, in 1990, César Sirvent proposed that a deuterium comet, i.e., a comet with an anomalous high concentration of deuterium into its composition, may have exploded as a natural hydrogen bomb, generating most of the energy released. The sequence would be first a mechanical or kinetic explosion, and instants later a thermonuclear reaction generated by this first explosion. This hypothesis would explain the inconsistences related to an unusual high ratio of electromagnetic energy / kinetic energy and cited in the famous paper by Cowan, Atluri, and Libby published in Nature.[citation needed] It is, however, inconsistent with knowledge both of the composition of comets and of the temperature and pressure conditions necessary for initiating a nuclear fusion reaction.

Black hole

In 1973, Albert A. Jackson IV and Michael P. Ryan, Jr., physicists at the University of Texas, proposed that the Tunguska event was caused by a "small" (around 10-20 g to 10-22 g) black hole passing through the Earth. Unfortunately for this hypothesis, there is no evidence for a second explosion occurring as the black hole exited the Earth and it has not gained wide acceptance. Furthermore, Stephen Hawking's subsequent hypothesis that black holes radiate energy via Hawking radiation indicates that such a small black hole would have evaporated away long before it could encounter the Earth.


Antimatter


In 1965, Cowan, Atluri, and Libby suggested that the Tunguska event was caused by the annihilation of a chunk of antimatter falling from space. However, as with the other hypotheses described in this section, this does not account for the mineral debris left in the area of the explosion. Furthermore, there is no astronomical evidence for the existence of such chunks of antimatter in our region of the universe. If such objects existed, they should be constantly producing energetic gamma rays due to annihilation against the interstellar medium, but such gamma rays have not been observed.


The Wardenclyffe Tower


It has been suggested, by Oliver Nichelson, that the Tunguska explosion may have been the result of an experiment by Nikola Tesla using the Wardenclyffe Tower, performed during one of Robert Peary's North Pole expeditions.[2]


UFO crash


UFO aficionados have long claimed that the Tunguska event is the result of an exploding alien spaceship or even an alien weapon going off to "save the Earth from an imminent threat". This hypothesis appears to originate from a science fiction story penned by Soviet engineer Alexander Kazantsev in 1946, in which a nuclear-powered Martian spaceship, seeking fresh water from Lake Baikal, blew up in mid-air. This story was inspired by Kazantsev's visit to Hiroshima in late 1945.

Many events in Kazantsev's tale were subsequently confused with the actual occurrences at Tunguska. The nuclear-powered UFO hypothesis was adopted by TV drama critics Thomas Atkins and John Baxter in their book The Fire Came By (1976). The 1998 television series The Secret KGB UFO Files (Phenomenon: The Lost Archives), broadcast on Turner Network Television, referred to the Tunguska event as "the Russian Roswell" and claimed that crashed UFO debris had been recovered f

Identified flying objects (IFOs)

It has been estimated from various studies that 50-90% of all reported UFO sightings are eventually identified, while typically 10-20% remain unidentified. Studies also show only a tiny percentage of UFO reports to be deliberate hoaxes; most are honest misidentifications of natural and man-made phenomena.

Generally studies indicate that misidentifications fall into three basic categories: astronomical causes (planets, stars, meteors, etc.), aircraft, and balloons. These typically account for 80-90% of the IFOs, with all other causes (such as birds, clouds, mirages, searchlights, etc.) being rare and accounting for the remainder.

The actual percentages of IFOs vs. UFOs depends on who is doing the study and can vary widely depending on the used database, evaluation criteria, personal biases, and politics. Results can also fluctuate from year to year.