From: Chris Healey (email@example.com)
Date: Wed Sep 29 2004 - 13:40:14 MDT
IMHO, The third cause is the most probable root cause, but because if
you're using radio as a primary means of communication, it's generally
in your interests to use the medium with increasing effectiveness.
Most effective from an information content/density perspective should
indicate a strong incentive to use maximal compression (in so far as
this does not affect availability of use). And maximal compression
means that the signal would appear to a 3rd party as random noise,
since any remaining pattern would allow further compression.
This would appear to support the inner surface of your expanding
"light-shell". Although, it's extirely possible that they
self-destruct before ubiquitous near-maximal compression.
> -----Original Message-----
> From: firstname.lastname@example.org [mailto:email@example.com] On Behalf
> Of Thomas Buckner
> Sent: Wednesday, September 29, 2004 2:01 PM
> To: firstname.lastname@example.org
> Subject: Re: The Future of Human Evolution
> --- Randall Randall <email@example.com>
> > But UFAIs created light years away are not huge
> > threats, since
> > they need to know you're there, and that
> > information would seem
> > scarce.
> This may be the real answer to the famous
> question "Where are they?" ETs, I mean. Why does
> SETI have so much trouble finding any radio
> signals from other civs?
> Possibility: we're really the first.
> Possibility: civs self-destruct always, soon
> after transmissions start.
> OR: possibility: advertising your position is
> seen as bad policy in case there are any UFAIs
> (or UFETs) within radio-detectable distances, so
> narrow-beam communications such as laser become
> preferred after a few decades.
> In the second or third possibilities, the
> expanding radio-freq bubble is paper-thin, so
> that there might be a civilization within
> (say)100 light years which stopped transmitting
> radio long ago, and would not be detected that
> way except by someone in the zone where the
> bubble is passing. If the hypothetical 100 ly
> distant civ used radio/tv/radar from 300 to 200
> years ago, then stopped, a detector would need to
> be 100 to 200 ly in the OPPOSITE direction to
> pick up those signals. Here on Earth we would
> blindly assume there was nobody there (at least
> until some new telescope spotted the Great Wall
> of Xubxib).
> Tom Buckner
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