234 Aliens?.....Or Weird Stars:

Discussion in 'Astronomy, Exobiology, & Cosmology' started by paddoboy, Oct 20, 2016.

  1. paddoboy Valued Senior Member

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    Either stars are strange, or there are 234 aliens trying to contact us
    October 20, 2016 by Evan Gough, Universe Today

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    A portion of the 234 stars that are sources of the pulsed ETI-like signal. Note that all the stars are in the narrow spectral range F2 to K1, very similar to our own sun. Credit: Ermanno F. Borra and Eric Trottier This graph shows the number of detected signals by Spectral Type of star. Credit: Ermanno F. Borra and Eric Trottier
    We all want there to be aliens. Green ones, pink ones, brown ones, Greys. Or maybe Vulcans, Klingons, even a being of pure energy. Any type will do.

    That's why whenever a mysterious signal or energetic fluctuation arrives from somewhere in the cosmos and hits one of our many telescopes, headlines erupt across the media: "Have We Finally Detected An Alien Signal?" or "Have Astronomers Discovered An Alien Megastructure?" But science-minded people know that we're probably getting ahead of ourselves.

    Skepticism still rules the day when it comes to these headlines, and the events that spawn them. That's the way it should be, because we've always found a more prosaic reason for whatever signal from space we're talking about. But, being skeptical is a balancing act; it doesn't mean being dismissive.



    Read more at: http://phys.org/news/2016-10-stars-strange-aliens-contact.html#jCp
     
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  3. paddoboy Valued Senior Member

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    https://arxiv.org/ftp/arxiv/papers/1610/1610.03031.pdf


    Discovery of peculiar periodic spectral modulations in a small fraction of solar type stars:

    ABSTRACT

    A Fourier transform analysis of 2.5 million spectra in the Sloan Digital Sky Survey was carried out to detect periodic spectral modulations. Signals having the same period were found in only 234 stars overwhelmingly in the F2 to K1 spectral range. The signals cannot be caused by instrumental or data analysis effects because they are present in only a very small fraction of stars within a narrow spectral range and because signal to noise ratio considerations predict that the signal should mostly be detected in the brightest objects, while this is not the case. We consider several possibilities, such as rotational transitions in molecules, rapid pulsations, Fourier transform of spectral lines and signals generated by Extraterrestrial Intelligence (ETI). They cannot be generated by molecules or rapid pulsations. It is highly unlikely that they come from the Fourier transform of spectral lines because too many strong lines located at nearly periodic frequencies are needed. Finally we consider the possibility, predicted in a previous published paper, that the signals are caused by light pulses generated by Extraterrestrial Intelligence to makes us aware of their existence. We find that the detected signals have exactly the shape of an ETI signal predicted in the previous publication and are therefore in agreement with this hypothesis. 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. However, at this stage, this hypothesis needs to be confirmed with further work. Although unlikely, there is also a possibility that the signals are due to highly peculiar chemical compositions in a small fraction of galactic halo stars.
     
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