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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
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« Reply #15 on: February 04, 2010, 01:23:38 pm »

Dyson (1959, 1966)   proposed   the   search   for  huge  artificial
       biospheres created around a star by an intelligent species as part
       of its technological growth and expansion within a planetary system.

       This giant structure would most  likely  be  formed  by  a  swarm of
       artificial habitats and   mini-planets   capable   of   intercepting
       essentially all the radiant energy from the parent star.

       According to Dyson  (1966),  the mass of a planet like Jupiter could
       be used to  construct an immense  shell  which  could  surround  the
       central star, having a radius of one Astronomical Unit  (A.U.).  The
       volume of such a sphere would be 4cr2S, where r is the radius of the
       sphere (1 A.U.)  and  S the thickness.  He imagined a shell or layer
       of rigidly built objects Dw10exp6 kilometers in diameter arranged to
       move in orbits  around the star.   The  minimum  number  of  objects
       required to form  a  complete  spherical  shell  [2]  is  about  N=4
       PIrexp2/Dexp2w2x10exp5 objects.
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