From: Paul Grant (shade999@optonline.net)
Date: Fri Jul 11 2003 - 21:48:51 MDT
-----Original Message-----
From: owner-extropians@extropy.org [mailto:owner-extropians@extropy.org]
On Behalf Of Robert J. Bradbury
Sent: Thursday, July 10, 2003 11:11 PM
To: extropians@extropy.org
Subject: Re: Sol-like system discovered...SETI new directions?
On Thu, 10 Jul 2003 ABlainey@aol.com wrote:
It is also true that to get gravity waves one has to manipulate *very*
large masses.
Me: or shutter a large mass :) like a signal fire :) Why build the fire
when you can misdirect it using a blanket :)
That is *very* expensive relative to the manipulation of photons (which
effectively have very low masses [based on E = mc^2]).
Me: Depends on how you do it :) no doubt an elegant solution is just
waiting to be found :) At this point, I wouldn't say its
impossible, or even improbable :) Just that more data is needed :) In
any event, it certainly is worth examining, if nothing
else for the questions it would raise.... As to light, generally
coherent light is used as signaling mechanism; however, the
same effect (a sheild) could be used for say, the light of a
sun(star)...
consider the effective size of the sun on our retina...now say I had a
shield roughly the size of the moon (the size of the shield
would of course, be dependant on the resolution of our telescopes versus
the distance to the receiver.... ergo, if we were trying
to communicate really far away, you could scale the size of the shield
down, and place it in an orbit), I could open or shut
it using morse code. certainly anybody looking at the sun would notice
my attempt at communication... and you could further
enhance said communication system, by aiming additional telescopes
(corrected for phase), off stellar clouds of gases
and synchronizing a shield-gate system, thus minimizing down time (where
other stellar objects blocked the receivers view
of the source 'light'). The main reason I don't like this as an
approach, is that I suspect that gravity propogates
faster :) but the same effect could be generated by skewing the
pulse...
for instance, say I have a stable stellar object which is generating
large gravitational pulses, coded to a particular
frequency; say I know where my receiver is; there's no reason why I
couldn't have a significantly smaller gravitational
force (would probably be energy-based, not matter based) skew the
generating source frequency enough to mess up
the receivers signal. It would be the equivalent of us agreeing on a
stellar object, measuring its frequency, the receiver
setting his receiver to that frequency, and us introducing a "drift"
from the source transmitter, using the drops as a method
of communicating information.
Another really interesting question, which just occurred to me, is:
does gravity reflect? are their materials which absorb/rebuff gravity...
or is it all simply a matter of constructive/destructive interference
sans reflection?
anyway :) all stuff over my head in any event...for now :P
omard-out
omard-out
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