There is a wrinkle here. Early broadcasts are too low
in power to make us very radio-bright. But after WWII,
the energy and the wider spectrum make our profile
soar to phenomenal levels. TV was a major contributor
to our emergence as a bright radio source, astronomically.
Then, in the 70's, we begin the switch to satellites which
direct signals downward (to absorption) and in the 80's
to optical lines. The radio brightness declined as we got
more efficient with signals and receptions and went to
more contained data transmission methods.
But since the 90's our radio-brightness has been creeping
back up again, due to the sheer volume of spectrum usage
and new devices. I'm certain that eventually we get back
to astronomical brightnesses; growth of humanity will
take us there.
By the time we inhabit the entire solar system in vast
numbers, we be one of the brighter radio sources in
the galaxy over a wide range of bands. Imagine trillions
of interplanetary cellphones. Imagine thousands of
navigation beacons. Imagine a vast network of deep
space radars tracking millions of "rocks."
We will GLOW.
And so would any other system-wide interplanetary
civilization. Where are they? No sign.
As for the argument that they would use something
more "sophisticated" that electromagnetic radiation...
it is wrong, for economic reasons. It will always be
possible to transmit more bits of information at a lower
cost in energy via the EM spectrum than by any other
means.
We will always swim in the EM soup.
Sterling K. Webb
-----------------------------------------------------------------------------
----- Original Message -----
From: "Steve Dunklee" <[email protected]>
To: <[email protected]>; <[email protected]>;
<[email protected]>
Sent: Thursday, October 07, 2010 11:13 AM
Subject: Re: [meteorite-list] '100 percent' chance for life on
newlyfoundplanet?
you are forgetting the first commercial radio stations. WJR which was
WCX began broadcasting in 1922 . Thats about 88 light years of radio
signals from Detroit. I wonder what they would think of us hearing
music and shows like "the lone ranger" and "flash gordon" . If there
is anyone out there. Cheers Steve
On Wed Oct 6th, 2010 6:11 PM EDT Sterling K. Webb wrote:
We have already sent them "I Love Lucy," just
by broadcasting it from October 15, 1951 to
May 6, 1957. In the Fifties, the radio brightness
of the Earth was about 700 times greater than
our Sun's radio brightness. A bright radio source
in orbit about a G-class star is like firing up a
beacon for everyone within 50 lightyears, one
that screams "Yoo-Hoo!"
There are about 2000 stars (in 1400 star systems)
within 50 lightyears of us, all of whom have gotten
all the episodes of "I Love Lucy" by now. About 133
of these stars are similar to our Sun. Here's a map
of our Neighborhood:
http://www.atlasoftheuniverse.com/50lys.html
and Gliese 581 isn't bright enough to make the
cut; it's not on the map. Nobody cares about red
dwarves...
There are 33 stars with 12.5 lightyears of us.
http://www.atlasoftheuniverse.com/12lys.html
Most of those stars could have sent us a message
after they watched the first episode of "Gunsmoke"
and we would have had the message before the show
went off the air.
An alien civilization fascinated by "Soul Train"
(and who isn't?) could have watched the first few
years of the show and sent us a message we'd have
by now out to 20-22 lightyears.
Maybe we won't hear from them until they find
out their favorite show was cancelled? Or maybe
they're satisfied to just watch the re-runs of
"Star Trek"?
Sterling K. Webb
-------------------------------------------------------------------------
----- Original Message ----- From: <[email protected]>
To: <[email protected]>
Sent: Wednesday, October 06, 2010 4:29 PM
Subject: Re: [meteorite-list] '100 percent' chance for life on
newlyfoundplanet?
Ok then - how about a Radio Transmission. I would assume we are
doing
this. What would we send?<<
How about all the re-runs of I Love Lucy?
GeoZay
______________________________________________
Visit the Archives at
http://www.meteoritecentral.com/mailing-list-archives.html
Meteorite-list mailing list
[email protected]
http://six.pairlist.net/mailman/listinfo/meteorite-list
______________________________________________
Visit the Archives at
http://www.meteoritecentral.com/mailing-list-archives.html
Meteorite-list mailing list
[email protected]
http://six.pairlist.net/mailman/listinfo/meteorite-list
______________________________________________
Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html
Meteorite-list mailing list
[email protected]
http://six.pairlist.net/mailman/listinfo/meteorite-list
