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Thread: NASA Live

  1. #2281
    Liare's Avatar
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    Quote Originally Posted by Rakshasa The Cat View Post
    Quote Originally Posted by Liare View Post
    1200 light years.
    1200 years has pretty clear changes in the atmospheric composition that would indicate civilizations are active.
    such as ?

    there's around 200-220 million people around at this point, the vast majority living off subsistence farming with a quite low ecological footprint and organized civilizations are generally confined to small clusters separated by significant wilderness. us shifting the atmosphere make-up significantly comes with the industrialization almost a thousand years later.
    Viking, n.:
    1. Daring Scandinavian seafarers, explorers, adventurers, entrepreneurs world-famous for their aggressive, nautical import business, highly leveraged takeovers and blue eyes.
    2. Bloodthirsty sea pirates who ravaged northern Europe beginning in the 9th century.

    Hagar's note: The first definition is much preferred; the second is used only by malcontents, the envious, and disgruntled owners of waterfront property.

  2. #2282
    Moderator Moderator Evelgrivion's Avatar
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    Quote Originally Posted by Rakshasa The Cat View Post
    Quote Originally Posted by Evelgrivion View Post
    Quote Originally Posted by Rakshasa The Cat View Post
    You don't need that large a structure to occlude a star if the occlusion target is another star a couple thousand lightyears away.

    Put something out in the kuiper-belt at the right spot ant very little energy is required to keep it in position.
    There appears to be periodicity in the dips at ~750 days. Interstellar medium solutions are probably not workable.
    The further you are away from a body of mass, the less orbital energy you have.

    So it is way cheaper in terms of dV to move an object that is far away back-and-forth than one that is close to the sun. So if you want to communicate by the means of occlusion you would put the object far out, and 750 days isn't really that weird if they've just recently spotted the changes in earth's atmosphere indicating civilization.

    Now if the weirdness keeps the 750 day periodicity then it is likely natural, if it becomes more frequent as the occlusion disk finds it's proper orbit then not.
    Spectral data from the Keck Telescope is in. There's no reddening in the star's spectrum, ruling out solutions in the Interstellar Medium.

  3. #2283

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    Quote Originally Posted by Evelgrivion View Post

    Spectral data from the Keck Telescope is in. There's no reddening in the star's spectrum, ruling out solutions in the Interstellar Medium.
    Seeing how we live in such a silly time I actually had to check wether there was a Keck telescope or not. Seems it's a real thing. That is all.

  4. #2284
    Donor erichkknaar's Avatar
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    Quote Originally Posted by Spartan Dax View Post
    Quote Originally Posted by Evelgrivion View Post

    Spectral data from the Keck Telescope is in. There's no reddening in the star's spectrum, ruling out solutions in the Interstellar Medium.
    Seeing how we live in such a silly time I actually had to check wether there was a Keck telescope or not. Seems it's a real thing. That is all.
    I visited a couple of months ago. It's quite impressive.

  5. #2285
    Moderator Moderator Evelgrivion's Avatar
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    http://www.astronomerstelegram.org/?read=10406

    They see no change in spectrum that isn't attributable to Teluric absorption (the effects of light going through the atmosphere). This seems to suggest that the dimming is potentially caused by occlusion from a solid object.

    In an initial analysis we find no difference between the two spectra apart from in features that are attributable to the expected variable telluric absorption features in the Earth's atmosphere.
    Last edited by Evelgrivion; May 20 2017 at 05:16:40 PM.

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