http://www.bbc.co.uk/news/science-en...449?print=true
Quote:
Alien hunters 'should look for artificial intelligence'
By Jason Palmer Science and technology reporter, BBC News
A senior astronomer has said that the hunt for alien life should take into account alien "sentient machines".
Seti, the Search for Extraterrestrial Intelligence, has until now sought radio signals from worlds like Earth.
But Seti astronomer Seth Shostak argues that the time between aliens developing radio technology and artificial intelligence (AI) would be short.
Writing in Acta Astronautica, he says that the odds favour detecting such alien AI rather than "biological" life.
Many involved in Seti have long argued that nature may have solved the problem of life using different designs or chemicals, suggesting extraterrestrials would not only not look like us, but that they would not at a biological level even work like us.
However, Seti searchers have mostly still worked under the assumption - as a starting point for a search of the entire cosmos - that ETs would be "alive" in the sense that we know.
That has led to a hunt for life that is bound to follow at least some rules of biochemistry, live for a finite period of time, procreate, and above all be subject to the processes of evolution.
But Dr Shostak makes the point that while evolution can take a large amount of time to develop beings capable of communicating beyond their own planet, technology would already be advancing fast enough to eclipse the species that wrought it.
"If you look at the timescales for the development of technology, at some point you invent radio and then you go on the air and then we have a chance of finding you," he told BBC News.
"But within a few hundred years of inventing radio - at least if we're any example - you invent thinking machines; we're probably going to do that in this century.
"So you've invented your successors and only for a few hundred years are you... a 'biological' intelligence."
From a probability point of view, if such thinking machines ever evolved, we would be more likely to spot signals from them than from the "biological" life that invented them.
'Moving target'
John Elliott, a Seti research veteran based at Leeds Metropolitan University, UK, says that Dr Shostak is putting on a firmer footing a feeling that is not uncommon in the Seti community.
"You have to start somewhere, and there's nothing wrong with that," Dr Elliott told BBC News.
"But having now looked for signals for 50 years, Seti is going through a process of realising the way our technology is advancing is probably a good indicator of how other civilisations - if they're out there - would've progressed.
"Certainly what we're looking at out there is an evolutionary moving target."
Both Dr Shostak and Dr Elliott concede that finding and decoding any eventual message from such alien thinking machines may prove more difficult than in the "biological" case, but the idea does provide new directions to look.
Dr Shostak says that artificially intelligent alien life would be likely to migrate to places where both matter and energy - the only things he says would be of interest to the machines - would be in plentiful supply. That means the Seti hunt may need to focus its attentions near hot, young stars or even near the centres of galaxies.
"I think we could spend at least a few percent of our time... looking in the directions that are maybe not the most attractive in terms of biological intelligence but maybe where sentient machines are hanging out."
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I have subscribed already years ago to the idea that a majority of intelligent "life" out there probably is basing on artifical technology that we may or may not be able to perceive as such, but that has taken over the task of "being aware and being intelligent" from its former organic creators. Not necessarily by a revolt of the machines, but because it may just be the consistent next step, since organic life and it's limited life span may be forever severly handicapped when negotiating stellar dimensions of space and time.
whether we are capable to recognise a superior intelligence as such, is something different. I think in most situation we would not recognise it, becasue it's intelligence is of a complexity and superiority that it simply is beyond our intellectual capacity to recognise it, like the ant you meet in the woods does not recognise you as well - all it may experience and feel is the drop in light and temperature when your shadow falls on the spot of the earth where it is crawling.
In the same way we may be unable to recognise intelligence that is too strange for the ways in which we understand and define "intelligence".
Alien technology also should not be taken for granted to follow the design and idea of the term "technology" like we have it. In the end, all terrestric concepts of "science fiction" - are earth fiction only, thought out by the mind of one species of naked apes living on this planet.
Finally, I have dramatically changed my mind over the past years on the question whether or not we should make known our existence by sending messages into space. In the past I thought that to be cool, but when looking at the history of our species, then I must realise that whereever two cultures have met, the superior in power annihilated or assimilated the inferior. We have no reason to rule out that in the cosmic game it goes any different. This does not mean that ET is a powerhungry warmonger.
But we also have no reason to imagine that he is not. That'S why i think it is better to sit silent and just listen, instead of sending messages. Our planet is becoming much more quiet, after the era of powerrful radio transmissions. Internet, cables, and satellites have stealthed the electromagnetic noise the Earth is transmitting into space. we cannot get back the old radio transmissions of the past decades - but we must not add additional ones, even messages giving clues on our construction blueprint and position. That is info to be shared amongst friends.
We do not know if in ET's language the word "friend" even has a meaning. Maybe in his culture, friends eat each other and consider that to be an act of politeness.
"The truth, as always, will be far stranger." (Arthur C. Clarke).