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Detectability of Extraterrestrial Technological Activities

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Author Topic: Detectability of Extraterrestrial Technological Activities  (Read 417 times)
Jennifer Murdoch
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« on: February 04, 2010, 01:19:24 pm »

 conditions prevailing in   the  emitter.   The  propagation  of  the
       information carried by electromagnetic  waves  (photons) is affected
       by the conditions  along  its  path.   The trajectories  it  follows
       depend on the local curvature of the Universe, and thus on the local
       distribution of matter  (gravitational lenses), extinction affecting
       different wavelengths unequally,   neutral  hydrogen  absorbing  all
       radiation below the  Lyman  limit  (91.3  mm),  and  absorption  and
       scattering by interstellar  dust,  which  is  more  severe  at short
       wavelengths.

       Interstellar plasma absorbs  radio  wavelengths  of  kilometers  and
       above, while the  scintillations  caused  by  them   become  a  very
       important effect for  the  case  of  ETC  radio messages (Cordes and
       Lazio, 1991).

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