Tuesday April 25, 2017



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Mysterious Star Pulses May Be Alien Signals...


Strange pulses of cosmic light might be signals from hundreds of different alien civilization or just the latest false alarm in the tortuous search for ET.

This month, astrophysicists Ermanno Borra and Eric Trottier, both from Laval University in Quebec, announced that they had spotted mysterious light signals coming from 234 different stars in our Milky Way galaxy. These pulses match the profile of signals that Borra, in a 2012 paper, predicted intelligent aliens might use to get our attention, the authors wrote.

"We find that the detected signals have exactly the shape of an ETI [extraterrestrial intelligence] signal predicted in the previous publication and are therefore in agreement with this hypothesis," the duo wrote in the paper, which was published online Oct. 14 in the journal Publications of the Astronomical Society of the Pacific. [13 Ways to Hunt Intelligent Aliens]

"The fact that they are only found in a very small fraction of stars within a narrow spectral range centered near the spectral type of the sun is also in agreement with the ETI hypothesis," the researchers added in the study. (Borra and Trottier looked at the spectra of 2.5 million stars studied by the Sloan Digital Sky Survey, which uses a telescope in New Mexico.)

But don't get too excited: Borra and Trottier said that additional observations are needed to confirm this hypothesis, and outside astronomers are even more emphatic on this point. Indeed, a healthy dose of skepticism is warranted, said Seth Shostak, a senior astronomer at the SETI (Search for Extraterrestrial Intelligence) Institute in Mountain View, California.

For example, it seems unlikely that 234 separate alien societies would be sending out such similar signals more or less simultaneously, Shostak said.

"It would be like expecting us to send the same signals as the Abyssinians — it doesn't make a whole lot of sense," he told Space.com. "If I were a betting guy, I'd bet this is an artifact of the way they processed their data."

Shostak also said that he knew of six different reviewers who had recommended against publishing the paper, at least without significant revision. However, he did stress that Publications of the Astronomical Society of the Pacific is a reputable journal.

The astronomers behind Breakthrough Listen, a $100 million project that's scanning the heavens for SETI signals over the next 10 years, also urged skepticism.

"The international SETI community has established a 0-to-10 scale for quantifying detections of phenomena that may indicate the existence of advanced life beyond the Earth called the 'Rio Scale,'" team members of Breakthrough Listen, whose science program is headquartered at the Berkeley SETI Research Center (BSRC) at the University of California, Berkeley, said in a statement. "The BSRC team assesses the Borra-Trottier result to currently be a 0 or 1 (None/Insignificant) on this scale."






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