SETI

On the extraction of all information embedded in radio siganls: Implications for SETI

A new idea for utilizing all of the information in photons for communication involves a little-know electromagnetic property: the photon's orbital angular momentum (POAM). The communication and computer industries are actively looking at the possibilities. We will discuss current research and the implications for SETI. 

The End of the Habitable Zone: Lessons from the Solar System

Phenomena in the Solar System have shown that temperatures can be suitable for life at great distances from a star as a result of the action of various forms of  "insulation".   The forms of "insulation" include a solid surface, an ocean, and a greenhouse atmosphere.  It is interesting to note that there appears to be no plausible atmosphere which produces an "anti-greenhouse", a cooling effect.   The existence of insulation greatly extends the habitable zone.  In addition, with regard to the ubiquitous M-stars, the observed large fraction of extrasolar planets with substantial eccentriciti

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