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Detectability of Extraterrestrial Technological Activities


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Author Topic: Detectability of Extraterrestrial Technological Activities  (Read 669 times)
Jennifer Murdoch
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« on: February 04, 2010, 01:17:39 pm »

Information carriers, however, are  not  infinite  in  variety.  All
       information we currently have about the Universe  beyond  our  solar
       system has been  transmitted  to  us  by  means  of  electromagnetic
       radiation (radio, infrared, optical,  ultraviolet, X-rays, and gamma
       rays), cosmic ray particles (electrons and atomic nuclei),  and more
       recently by neutrinos.

       There is another possible physical carrier, gravitational waves, but
       they are extremely difficult to detect.

       For the long  future  of humanity, there have also been speculations
       about interstellar automatic probes  that  could  be  sent  for  the
       detection of extrasolar life forms around the nearby stars.

       Another set of   possibilities   could   be   the    detection    of
       extraterrestrial artifacts in  our  solar system, left here by alien
       intelligences that want to reveal their visits to us.

       Table 1 summarizes the possible "information  carriers" that may let
       us find the evidence of an extraterrestrial civilization,  according
       to our knowledge  of  the  laws  of  physics.  The classification of
       techniques in Table  1  is  not  intended  to  be  complete  in  all
       respects.

       Thus, only a few fundamental particles have been listed.  No attempt
       has been made  to  include any antiparticles.  This  classification,
       like any such  scheme,  is also quite arbitrary.  Groupings could be
       made into different "astronomies".
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