Again and again mankind asks itself the question whether there is intelligent extraterrestrial life or whether we are really on our own. The fact is, astronomers regularly perceive radio signals that seem to come from distant star systems. The radio telescopes used for this purpose are so sensitive that they could pick up even extremely weak radio signals. Puzzling videos and photos of seemingly unknown flying objects also appear again and again. But how many of them are really real and how many are just faked? The same question arises for crop circles, which have already been sighted in many places worldwide. In many cases, however, fraudsters revealed themselves, people who just wanted to draw attention to themselves. By contrast, U.S. Navy fighter jets filmed three flying objects between 2004 and 2015 that they could not pinpoint.
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Credit: NASA, ESA, ESO, SpaceX, Wikipedia, Shutterstock, …
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