Says Martina Japec
http://www.express.hr/autori/martina-japec-859/

At
http://www.express.hr/znanost/50-godina-kruzi-oko-zemlje-a-nitko-ne-zna-sto-je-7995

While some argue that this is just a conspiracy theory, other - and even Nikola Tesla, believed that this is the extraterrestrial intelligence (today would be called AI)

Unusual and unidentified it is moving in the orbit of the Earth, according to some claims it does this for the past 50 years. They call it the Black Knight, and many conspiracy theorists believe that is of the extraterrestrial origin and that it is old about 13 thousand years.

Nikola Tesla was the first to record sounds that he heard from space in 1899, believing that they were signals of intelligent life.

He wrote:
I'll never forget the first feelings that I experienced when it dawned on me that I was watching something potentially far-reaching importance for humanity. I felt like to attend the birth of new knowledge or the discovery of a great truth. Even today very clearly remember the event and appliances, as it is now in front of me. My first observations positively frightened me because they are wearing something mysterious, not to say supernatural. I was alone in the lab and it was night, but then my mind has not dropped the idea that these disturbances may be intelligently controlled signals. The changes that I noticed were periodic, with so many distinct characteristics and the number of rows that I could not connect with anything that was familiar. They are familiar, of course, these electrical disturbances since their origin was the sun, the Aurora Borealis, or convection currents of the earth, no one, I am sure, were not the cause of him that I had heard. Although I could not decode their meaning, it was impossible to think of them as something randomly,. The menu is constantly growing feeling that I was the first man who has heard the greeting of one planet to another.

Astronomers 1968 to confirm that indeed heard the radio signals, but it is a pulsars in deep space. Several daily newspapers including the San Francisco Examiner wrote about this unusual phenomenon, expressing the opinion of a former naval officer and pilot Donald Edward Keyhoea, the famous investigator of UFOs.

He was in his youth wrote about the American tour of Charles Lindbergh and aviation fiction, and at the beginning of the Second World War he returned to military service to train pilots. His theory is that the aliens had indeed visited Earth, and in his books made the claim that the US military forces detect two satellites in Earth orbit in 1954.

At that time, no world power did not have the technology to launch objects into orbit and is Keyhoe concluded that the satellites izvanzenmaljskog of origin which come from a planet located in the solar system star Epsilon Bootis.
The legend of the Black Knight

Although skeptics argued that such theses Keyhoe only trying to promote his book, he managed to capture the attention of the public, and it was also the beginning of the legend of the mysterious Black Knight.
Even the respected Time Magazine in 1960, during the Cold War, wrote that the US Navy is aware of the existence of unusual satellites orbit with apogee of 1,728 kilometers and the perigee of only 216 kilometers. At first it was believed that this was a Soviet satellite, but later even speculated that the satellite may be American.

Reports of the Black Knight brought a lot of hearsay, according to a NASA astronaut Jerry Ross, the object is simply the result of an error.

The most recent event that are associated with the 'Black Knight' took place in 1998. In December, the space shuttle Discovery left the International Space Station on a mission which is supposed to "catch" Russian FGB module in a low orbit, and attach it to the US Node 1, and create a "space walks" to install the necessary equipment. Colonel Ross et al. Newman were trying to install thermal blankets on the shoulder of the needle attached to the space station, in order to reduce heat loss and save energy. However, when setting up, the blanket they flew.

Namely, at a NASA photograph resulting during the STS-88 mission is seen black object which, of course, immediately began to associate with the legendary 'Black Knight', but experts have explained that this is probably a thermal blanket that are lost during the mission Jerry L . Ross and James H. Newman.

In an interview from 2014, Colonel Ross said:
If you see something up there we will be the first to talk about it and ask questions, and tell the people that we see something we do not understand. Conspiracy theories are fun for those who work on them, but the loss of valuable brain power.

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IZAKOVIC