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10 times we thought we had evidence of aliens

Are we alone in the universe? Ever since humanity discovered the existence of other planets and solar systems, we wondered if we could one day be contacted by another intelligent species. International SETI science projects and amateur backyard astronomers have launched their telescopes into space to find transmissions that may have been broadcast by extraterrestrial civilizations. The search for evidence of extraterrestrial life is so deeply rooted in our minds that countless eye-witness stories about unknown flying objects and other strange phenomena were triggered.

There were several occasions when scientists thought they had detected signs of extraterrestrial intelligence, only to find that the findings were something else, ranging from a pulsar to a leaky microwave. Some electromagnetic wave transmissions and strange sightings have never received a final explanation. From current scientific hypotheses to the most famous comic UFO theories, here are ten signs of extraterrestrial life that either turn out to be false positives or still have no official explanation.

Martian Canals

One of the great astronomical misconceptions of the late 19th and early 20th centuries was the idea that channels existed on the Martian surface. [1] Some astronomers concluded that the only explanation for these channels was that they were built by an intelligent irrigation species. American astronomer Percival Lowell has published a trilogy of books explaining his theory on the channels' intelligent design, and the press has spread the idea to the public.

The debate on the existence of Martian structures and life lived until the early 20th century As technology evolved, the whole concept of the channels proved wrong. The canals were merely an optical illusion, caused by the blurred telescopes of the time and the tendency of the mind to connect dots to lines.

9 The HD 164595 signal

HD 164595, a star very similar to our Sun, made headlines in 2016 when it became known that in 2015 a possible alien signal was sent out of its direction. [2] The star is orbited by a planet that can not sustain life, but it has been hypothesized that the star may have more undiscovered planets orbiting it. The signal lasted two seconds and was recorded only once. Since it was so short, the source was hard to determine.

The search for extraterrestrial intelligence (SETI) examined the signal to evaluate its possible extraterrestrial origin. SETI concluded that it was probably caused by terrestrial interference since it was only detected by a telescope. Its exact origin was never found out, but most likely it came from a satellite.

8 Kenneth Arnold

The world is full of unreliable eyewitness stories about flying saucers, but the UFO story of aviator and businessman Kenneth Arnolds was the first to be widely reported in the media. In 1947 Arnold claimed to have seen nine strange flying objects flying over the state of Washington. He described how they moved like a saucer hopping on the water surface, and the press quickly came to the terms "flying saucer" and "flying disc" as they misunderstood Arnold's words and saw the flying objects shaped as saucers.

The Air Force stated that Arnold had seen a mirage, [3] but many people, including Arnold himself, were dissatisfied with this explanation, never letting go of the idea that he saw alien spacecraft. Later Arnold claimed to have seen more flying saucers and wrote a book about his experiences, which became almost a legendary character among the ufologists.

7 Perytons

For decades the Bleien Radio Observatory in Switzerland and the Radio Telescope Parkes In Australia short signals were heard that nobody could explain. They were called Peryton after the mythological hybrid creature Peryton. Their frequency and habit of clustering was similar to the behavior of Fast Radio Bursts (FRBs), which are extragalactic signals of unknown origin. It was thought that fast bursts were artificial messages sent by extraterrestrial intelligence, so the Perytons also led to speculation. It turned out that the signals came from near the earth, which exposed the alien theory, but their exact origins were a mystery for years.

The puzzle was finally solved in 2015, when Parkes telescope scientists discovered the more banal source of signals: their leaking kitchen microwave. Each time the microwave door was prematurely opened, a radio pulse was triggered reminding of FRBs. Sometimes great mysteries have oppressive explanations. [4]

6 Rapid Radial Jumps of Alien Spaceships

The unexplained fast telescopes captured by telescopes around the world were theorized news of extraterrestrial species, but in 2017 hit Scientists think they might have a different kind of foreign origin. Manasvi Lingam and Abraham Loeb hypothesized that the radio bursts could be used to propel advanced alien spaceships in the expanse of space. [5] In this theory, the discovered FRBs are not news to us, but a byproduct of the spaceships must be powered by something stronger than normal fuel.

Lingam and Loeb did the math to support their idea, but recent results from FRBs that repeat themselves and come from a certain place in the sky make this theory seem less plausible. The outbreaks could actually be caused by neutron stars or be related to black holes.

5 Crop circles

Crop circles, also called cultivated plants, are large patterns that are produced on fields by depressing the plants. In the last four decades more and more of these formations have appeared, even if the idea itself is nothing new. Their appearance and their enormous size make them seem mysterious, and some people who study the patterns have claimed that there is no way they were created by man.

The theory that extraterrestrials form the circles as messages was never supported by scientists after the phenomenon had become widespread in the media, the public became aware of. In fact, crop circles are made by humans. Some are works of art; others are just pranks that are meant to confuse the public. [6] Nevertheless, the theory of UFOs that created the cultural formations continues in some pseudoscientific belief systems, though it has been refuted.

4 Alien Megastructures Around Tabby's Star [19659027] The now retired Kepler space observatory is famous for its search for Earth-like planets orbiting other stars. In 2015, citizen scientists who went through the data collected by Kepler noticed something out of the ordinary about a star. Tabby's star, officially known as KIC 8462852, had some unusual brightness changes. The star seemed to have irregular light fluctuations, which became considerably weaker.

There were several theories about the origin of the phenomenon. Some astronomers suggested that alien megastructures could be around the star. [7] Megastructures that cover an entire star, such as Dyson swarms, were originally introduced to science fiction, but found their way to actual scientific thought experiments. Tabby's star has been of great interest to SETI, but recent studies indicate that dimming is most likely caused by dust, not opaque objects, intelligent or natural.

3 Roswell UFO incident

Roswell's incident is probably the most famous UFO story ever. The US military and the US politicians had even several decades later to comment on the incident several times. In the summer of 1947, a United States Army Air Force balloon crashed on a ranch in New Mexico. A man named William Brazel found the rubble and after hearing stories about flying saucers, told the local sheriff he had found the remains of one. The sheriff called the local air force base, which issued a news release about the event. [8] There was great interest until a new press release was issued to explain the balloon's earthly origin.

Decades later, the incident received new attention as UFO investigators began to interview the alleged witnesses and review documents. The new theory was that extraterrestrial bodies had been removed from the crash site and the US government had been covering up the truth about the Roswell events. This may sound farfetched, but in a 2013 US poll, a fifth of respondents still believed that the Roswell incident was indeed a UFO crash, making it one of the most widely believed alien theories.

2 The Little Green Men Signal

In 1967, graduate student Jocelyn Bell discovered a strange signal at the Mullard Radio Astronomy Observatory in the UK. The signal was so constant and fast that it looked artificial, but it was not man-made. Bell and her advisor Antony Hewish called him LGM-1 for "Little Green Men." [9] Extraterrestrial messaging was not the prime suspect of the scientists, but they had to consider the possibility and the possibility of communicating it to the public. It turned out to be extraterrestrial. When they detected a similar signal, they excluded the possibility of extraterrestrials, as it was unlikely that two separate alien species would attempt to communicate with them at the same time.

In fact, Bell and Hewish had discovered pulsars, rotating neutron stars that emit electromagnetic radiation. The rays of such rotating stars are directed at the earth at regular intervals and act like intelligently designed transmissions. Although it was a false alarm regarding aliens, the discovery of pulsars was a very useful finding for astronomers.

1 Wow! Signal

In 1977, SETI astronomer Jerry R. Ehman reviewed the data collected the day before from Ohio State University's "Big Ear" telescope. He noticed that the telescope had taken 72 seconds of a remarkable, strong signal. What made the signal so remarkable was its frequency. The frequency range of the signal is protected, ie no one on earth can send on it. So the signal does not come from Earth.

At the same time, this particular frequency could be very plausibly used for communication. It would make sense for an intelligent species to choose a "channel" that is easy to hear, unlike the frequencies of the Big Bang background radiation or quantum noise. It also mimicked the electromagnetic wavelength of hydrogen, the most abundant and easily recognizable element in the universe.

The signal became "Wow!" After the excited comment Ehman wrote on the computer printout. Called. The source of Wow! was never determined [10] making it the strongest candidate for alien messaging ever discovered.

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