Detection of Earth-like Civilizations in Space Now Possible 345
Mr. McGibby writes "Astronomers have come up with an improved method of looking for extraterrestrial life with an Earth-like civilization. Theorist Avi Loeb proposes to use instruments like the Low Frequency Demonstrator (LFD) of the Mileura Wide-Field Array (MWA), an Australian facility for radio astronomy currently under construction. The array could (theoretically) detect civilizations broadcasting in the same frequencies as our own society. From the article: 'Loeb and Zaldarriaga calculate that by staring at the sky for a month, the MWA-LFD could detect Earth-like radio signals from a distance of up to 30 light-years, which would encompass approximately 1,000 stars. More powerful broadcasts could be detected to even greater distances. Future observatories like the Square Kilometer Array could detect Earth-like broadcasts from 10 times farther away, which would encompass 100 million stars. ' The original paper describes the details."
Re:Knowing Your Neighbours (Score:5, Insightful)
And to quote Carl Sagan, "Absence of evidence is not evidence of absence."
Window of opportunity (Score:3, Insightful)
How long will we keep doing it?
Searching for XYZ years worth of RF in a bubble 60 light years across doesn't strike me as very promising.
Re:Knowing Your Neighbours (Score:5, Insightful)
Re:Hmm. (Score:5, Insightful)
The true probabilities are not known. We don't know how common life is. We don't know how often a mass extinction of life occurs. We don't know how long evolution takes except for on our one world. We don't have enough data to accurately predict whether or not life is rare or common in the universe. Another perspective could be that it is in fact more likely that advanced civilizations would be around at the same time if the universe has a consistant timeline. If the way that life-harboring star systems form, the way that life itself forms, and the way that intelligent life evolves is analogous across the universe then this may be the Golden Age of intelligent life throughout our galaxy.
if we're only now uncovering this new technology.. (Score:2, Insightful)
Faster than Light Communications (Score:2, Insightful)
I think the real issue isn't frequency, but technology. Personally I believe there must be a practical way to transmit data at faster than light speeds. We've been using the EM spectrum for transmitting for just over 100 years. If there are better methods of transmitting data, not only will our search area be limited, but we'll be searching for is possibly a short lived technology.
Listening for radio waves is futile (Score:2, Insightful)
Let's assume that we are a 'typical' univeral life form. I'm haven't brushed up on my radio broadcasting history but I'll assume that we've been broadcasting information in some form since the 1910's. Let's now say that for the next 400 years we use this type of technology to communicate. I think that is a very large estimate, though. By that time the human race will have progressed so far (IMHO) that we will need much quicker and reliable forms of communication because of advancements in space travel and that type of communication will even trickle down into normal, everyday communication on earth. Using all modern forms of communication will not suffice if we have bases of operation even as close as our nearest star. I don't know what it will be, but a solution will provide itself and I doubt it will be anything close to what we have now.
So, Let's assume then that we as humans use radio waves for 500 years, total. If you want, give or take an extra couple 100 years. It doesn't matter for the point I am trying to make. If we only use radio waves for a span of 500 years, than that amount of time is a drop in the bucket compared to the entire, vast expanse of time that has past in our universe.
If there is another civilization out there. I'm pretty sure that they are either way behind or way ahead of us in technological advancements. If they progressed at even a fraction of the rate that we have (and will), then the span of time at which that have transmitted any type of communication that we can currently understand and interpret is so short that it's a practical impossiblity that we will 'catch' it. Don't get me wrong, I'm not saying that the entire search for intelligent life in space isn't important. I'm just saying that the current technology that we have is in such an infantile state that it's a waste of time and resources that could be put towards better works of science.
Well, what are we looking for...? (Score:3, Insightful)
Re:Knowing Your Neighbours (Score:5, Insightful)
Re:Fiber to the Home. (Score:4, Insightful)
Re:Hmm. (Score:2, Insightful)
What the hey? I am still using spark gap and CW Morse Code. No, once a technology is in place, it rarely is completely eliminated. Some people still ride horses, ride bicycles, hike, etc, even though they have cars. I use CW even though I have SSB and digital modes available (and a lot of people do also). By the way, FM is already obsolete. Right now that is.
Re:Knowing Your Neighbours (Score:3, Insightful)
Regardless, you are attempting a negative proof or proof of impossibility. This is a logical fallacy. Interestingly, it works both ways. You can't prove a Yeti doesn't exist or that life (intelligent or otherwise) exists on other planets because you don't have evidence and vice versa. People can't prove either exist for lacking evidence. While the Yeti argument is another kettle of fish since life on earth is indirect evidence of life on other planets, it is a bit of a stretch but can be argued that the different primate groups are indirect evidence of the possibility.
Interestingly, Yeti and ETs share the distinction that there exists no clear evidence of either. It is possible that we will never have proof of the existence of either. Equally, we will likely never exhaust all possibilities to satisfy ourselves that neither definitely don't exist. Unless we plan on leveling all forests, excavating every square inch of earth (for archaeological evidence) and visiting every solar system and planet in the Universe. Both of which are equally absurd.
Re:Knowing Your Neighbours (Score:4, Insightful)
I'll take your quote and raise: "Extraordinary claims require extraordinary evidence"
Re:Knowing Your Neighbours (Score:5, Insightful)
You say "you are attempting a negative proof or proof of impossibility" which demonstrates you didn't actually read or understand the parent post which stated, quite clearly, "Absence of evidence is prima facie evidence of absence.", not "Absence of evidence is prima facie proof of absence". Until you sort out the difference between proof and evidence the rest of what you say is moot.
Re:Knowing Your Neighbours (Score:3, Insightful)
In science, proof is a very rare thing. All we have are hypotheses that are more or less likely, and evidence that makes them so.
Re:Knowing Your Neighbours (Score:2, Insightful)
Re:Window of opportunity (Score:2, Insightful)
If primitive life forms are discovered on any planet other than Earth, there would be an astronomically higher chance of there being primitive life on several planets across the universe and thus an astronomically higher chance of intelligent life out there.
It would, I hope, motivate a renewed search for life in the universe.
Re:Knowing Your Neighbours (Score:3, Insightful)
It does hurt when the funding, research, and effort could be put to better uses. We ought to work on our needs such as learning about our own planet (there's so much that we don't know), and how our species is going to survive, since at the current rate, survival could become a problem fairly soon. What we shouldn't be worrying about is philosophical questions like if there is life on other planets or the infamous "are we alone?" Sure, finding life on other planets can give immense insight into, among other things, how life is created in general and not just on Earth, but we might want to get to a stable point in society and survival where we're able to take time to study it. It also seems somewhat foolish to be looking at other parts of the universe since we're not able to travel anywhere in a resonable amount of time (reasonable as in under 10000 years) unless we develop ways to travel at large fractions of the speed of light. Even then, outside of our galaxy, the next closest galaxy is millions of light-years away, and the information we've received would be millions of years old. Knowledge is great and everything but the search for extraterrestrial life seems very pointless, especially at our current state.