No radio evidence of distant life

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A.D. 2050



No organized radio signals from outer space


With SETI having detected no modulated radio signals, there are likely no civilizations transmitting from within a few hundred light-years* of the solar system.

It seems like either they don't exist, don't still exist (relatively speaking )** — or didn't last.***

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* The Milky Way is about 100 thousand light-years wide, and about one thousand light-years thick at the center.

  ** We are seeing a star (for example) as it was however-many light-years away it is ago.

    *** Or they've just stopped transmitting.


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* "... despite an extensive search by the SETI project, we haven't heard any alien television quiz shows. This probably indicates that there are no alien civilizations at our stage of development within a radius of a few hundred light years."

  — Stephen Hawking, in lecture, 21 April 2008

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