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Detectability of Extraterrestrial Technological Activities

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Author Topic: Detectability of Extraterrestrial Technological Activities  (Read 698 times)
Jennifer Murdoch
Superhero Member
Posts: 5235

« Reply #15 on: February 04, 2010, 01:21:57 pm »

       kind of signals  near  the  galactic  center.   Because  one  of the
       characteristics of artificial transmitters (television, radar, etc.)
       is the highly  polarized  signal   (Sullivan  et  al,  1978),  these
       researchers made seven observing runs of roughly three  days each in
       a program to  scan  for  strongly  polarized  radio  signals  at the
       wavelength of lambda=2.82 cm.

       Radar Warning Signals

       Assuming that there is a certain  number  N  of civilizations in the
       galaxy at or  beyond  our  own  level  of  technical  facility,  and
       considering that each  civilization is on or near a planet of a Main
       Sequence star where  the planetoid  and  comet  impact  hazards  are
       considered as serious   as   here,  Lemarchand  and   Sagan   (1993)
       considered the possibility  for detecting some of these "intelligent
       activities" developed to  warn  of   these   potentially   dangerous

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