From: Kathy Kasten <catraja.nul> Date: Sun, 4 Dec 2011 19:21:50 +0000 Archived: Mon, 05 Dec 2011 07:39:14 -0500 Subject: Re: Let's Build A Beacon To Tell Aliens Who We Were >From: post.nul >To: ufo-updates-list.nul >Date: Sat, 3 Dec 2011 11:56:01 -0500 >Subject: Let's Build A Beacon To Tell Aliens Who We Were >Source: NewScientist.Com >http://tinyurl.com/7tey8to >02 December 2011 >Let's Build A Beacon To Tell Aliens Who We Were >by Chris Wilson >Somewhere in the cosmos, 36 light years away from us in the >direction of the Hercules constellation, a series of >electromagnetic waves stretching across 30 million miles of >space carries a message from Earth. Each of the 1,679 signals it >contains falls in one of two frequencies - an FM signal that >translates to a bunch of ones and zeroes. >This message originated in 1974, when it was broadcast from the >Arecibo radio telescope in Puerto Rico to commemorate the >facility's renovation. The authors of the message, Carl Sagan >and SETI founder Frank Drake, hoped that any aliens who happened >to receive it might notice that 1,679 is the product of two >prime numbers, 23 and 73, and if you arrange all the zeroes and >ones in a grid of 23 columns and 73 rows, you get a series of >simple, ASCII-like pictures, including a double helix and a >crude image of a person. Whether or not an alien civilization >could crack the code, they would at least notice something funny >about these FM signals. They're 10 million times stronger than >the background noise from our sun. >But no extraterrestrials will even get the chance. The Arecibo >transmission was aimed at a system 25,000 light years away that >will have long since orbited out of the signal's path by the >time it arrives in the vicinity. The odds of any two >civilizations ever overlapping in time are extremely small. Even >if we left the Arecibo telescope squealing out its signal until >its power ran out and its hardware rusted, there's virtually no >chance that the emanations would get anywhere in particular, and >hang around long enough to be seen or heard. The only way we'll >make contact is if we can make a beacon that keeps going for >millions or billions of years after we're gone. >[More at site... thanks to 'The Norm' for the lead] Sky & Telescope, January 2012 issue, page 28-31, Joseph Lazio provides the article "How Alien Astronomers Could Find Earth" The subtitle of the article "We could make it easier for our counterparts on distant planets to find evidence of our existence; but it would be a massive undertaking for us." The article details the question into two parts. 1) how much Earth emits detectable energy naturally; 2) how much radiation could our civilization generate to infer our existence. One of Lazio's suggestions is to build a particle accelerator in space which would beam neutrons. He notes that neutron trajectories would not be affected by interstellar magnetic fields. He argues that the Keck I & II laser beams are too weak to be detectable across interstellar distances. Lazio is a radio astronomer and he opines that radio signals are the most still the most practical for interstellar communication/detection. KK Listen to 'Strange Days... Indeed' - The PodCast At: http://www.virtuallystrange.net/ufo/sdi/program/ These contents above are copyright of the author and UFO UpDates - Toronto. They may not be reproduced without the express permission of both parties and are intended for educational use only.
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