IT'S ADVISABLE TO NOT TRANSMIT ELECTROMAGNETIC SIGNALS FOR S.E.T.I.
AND WE CAN'T EXPECT RECEIPT OF USEFUL ELECTROMAGNETIC SIGNALS EITHER.
EMR IS TOO SLOW / DIFFUSE FOR INTER-STELLAR COMMUNICATIONS - WE SHOULD EXPECT ADVANCED CIVILIZATIONS TO USE 'INSTANTANEOUS' & FOCUSSED UEF. ref-01
MORE COMPELLING REASON BELOW
"A civilization very much more advanced than we will be engaged in a busy communications traffic with its peers; but not with us, and not via technologies accessible to us."
"Communication with Extraterrestrial Intelligence" - by Carl Sagan (ed.) 1973 p. 366
"Communication is a universal, but the use of radio is a parochial, when we go out into the Galaxy ... a radio signal will be about as useful as a smoke signal. Communication evolves"
"Evolving the Alien" - by Profs. Jack Cohen & Ian Stewart, 2002. ISBN 0-09-187927-2
1) Solar system moves through spiral arms in a 25 - 35 million year cycle
Closeness to galactic center or shielding within spiral arm probably increases fertility and intellectual ref-02 progress
[UEF theory says more exposure to UEF pressure lowers fertility ref-03 and brain activity]
2) Hyron Spinrad found the metal content of stars - which indicates age of star generation - increases towards galactic centers
Isaac Asimov calculated - "It is nine times to eighty one times more likely that intelligence ref-04 has arisen earlier in the central region of our galaxy"
[Spinrad, Hyron 'Supermetallicity in nearby Galaxies' 1970 QrtlyJrnl of Royal Astronomical Society; also see ref-05]
[Asimov - basically because the class II stars of the central region are composed of older, recycled matter necessary for organic life.]
3) Any intelligences must be either more advanced, equivalent or more primitive
If any organisation exists it is most probably administered by one or more of the advanced ref-06 groups
Not obviously motivated to seek or to welcome 'primitives'
4) The best we could expect is intended non-interference
We may be living in a reservation, ghetto, or off-limits area
5) From our own experience we could expect only:
exploitative or meddling officials, careless patronizing tourists, murderous perverts or policemen, hanging around our ghetto.
Armed with 'magic' ref-07 technology.
6) So, what would you do . . . Shout? . . . Or Listen?
7) Listen - surely
but we can't listen unless we can receive the f.t.l or maybe even intantaneous signals an advanced civilization will be using - UEF modulation ref-01
"The development of beings capable of questioning and understanding the universe seems quite natural. I would be quite surprised if such intelligence has not arisen many places in our very large universe"
George Smoot (of COBE fame)
"Wrinkles in Time" 1993 ISBN 0-316-90508-9
"Why don't we see them?"
What does non-perception ref-08 prove?
Merely that such `perception' might be impossible. ref-08A
"Might a civilization composed of essentially immortal beings consider interstellar exploration fundamentally childish? It may be that we have not been visited because the stars are strewn abundantly in the expanse of space, so that before a nearby civilization arrives, it has altered its exploratory motivations or evolved into forms indetectable to us." - more
"Cosmos - the story of cosmic evolution, science and civilization"
"An advanced technology (say a million years old, or five hundred million, compared to the two hundred year history of `advanced' human technology) will be able to make, distribute, and hide artifacts that we cannot begin to imagine. That may well be the most likely scenario: Fermi's Paradox doesn't apply because the aliens are here, but we simply don't recognise them -
Prof.s Jack Cohen & Ian Stewart
"Evolving the Alien"
We say :-
An ethical adult wouldn't interfere with the growth of a non-talking/walking child of a different species.
"talking & walking"
are almost within reach ref-01
but we're still babes-in-arms right now!