Disclaimer

Many of my essays are quite old. They were, in effect, written by a person who longer exists in that my views, beliefs, and overall philosophy have grown and evolved over the years. Consequently, if I were to write on the same topics again, the resulting essays might differ significantly from their current versions. Rather than edit my essays to remain contemporary with my views, I have chosen to preserve them as a record of my past inclinations and writing style. Thank you for understanding.

April 2001

Aliens, UFOs, SETI

A complete and total waste of time guaranteed to utter failure [See footnote 1]

Brief Description

The universe is a big place. It seems arrogant to think there isn't anyone else out there. Well, that's not what I believe. There may be intelligent life in the universe, but there is none in our galaxy. That leaves hundreds of billions of other galaxies for extra terrestrials to reside in, but not this one. I also believe there is plenty of opportunity for biologically advanced (multicellular) life to exist in our galaxy, just not technologically intelligent life. My argument is grounded on a conjunction of the Fermi paradox and the present state of human technological evolution. Either one of these things alone makes a good argument against ET in our galaxy. When put together, the evidence is overwhelming and the conclusion is undeniable.

Full Description

Sections:

Introduction

Seems kind of out of place doesn't it? Here I am writing articles about how much I love science and technology. I've written about futuristic robots and such. I seem like the kind of person who would embrace exterrestrial life, don't I? Many other scientists seem to take that view. I used to believe the universe, including our galaxy, must be teeming with life. It seemed so obvious, basically for the same reasons that Carl Sagan was so popular for advocating. There is so much room out there for life to evolve and it seems to have occurred so easily on our own planet. It seems inevitable that there must be life out there, just waiting for us. It's exciting to think about for one thing, imagining a world inhabited not only by living beings, not only basic plants and animals, but thinking cognitive beings who we could communicate with. They might be far more advanced than us and could teach us incredible things about the universe. It would be like meeting God.

The problem is it's not going to happen. We aren't going to meet anyone. Space is a desolate place for sure, and we will discover no enlightened beings that can tell us the universe's secrets. This is an old debate and I don't believe I have anything too new to contribute (except in the afterthought section), but many people just don't seem to get it, so I feel it is necessary to repeat the good arguments for why this is the case.

What the proponents believe, Drake's equation

The main argument supporting a plethora of life in the universe, including our galaxy, is the Drake equation, created by Dr. Frank Drake in 1961. This is a very simple equation that yields the number of technologically advanced civilizations existing in our galaxy right now. It's really easy to understand. Here's how it works. You take a number of independent values that ET is dependent on and multiply them. The result is the number of planets with ET on them. The Drake equation looks like this (ripped from http://www.seti-inst.edu/science/drake-bg.html without permission):

N = R* x Fp x Ne x Fl x Fi x Fc x L

where,

N = The number of communicative civilizations

The number of civilizations in the Milky Way Galaxy whose radio emissions are detectable.
R* = The rate of formation of suitable stars (per year)

The rate of formation of stars with a large enough "habitable zone" and long enough lifetime to be suitable for the development of intelligent life.
Fp = The fraction of those stars with planets

The fraction of Sun-like stars with planets is currently unknown, but evidence indicates that planetary systems may be common for stars like the Sun.
Ne = The number of "earths" per planetary system

All stars have a habitable zone where a planet would be able to maintain a temperature that would allow liquid water. A planet in the habitable zone could have the basic conditions for life as we know it.
Fl = The fraction of those planets where life develops

Although a planet orbits in the habitable zone of a suitable star, other factors are necessary for life to arise. Thus, only a fraction of suitable planets will actually develop life.
Fi = The fraction life sites where intelligence develops

Life on Earth began over 3.5 billion years ago. Intelligence took a long time to develop. On other life-bearing planets it may happen faster, it may take longer, or it may not develop at all.
Fc = The fraction of planets where technology develops

The fraction of planets with intelligent life that develop technological civilizations, i.e., technology that releases detectable signs of their existence into space.
L = The "Lifetime" of communicating civilizations (years)

The length of time such civilizations release detectable signals into space.

Don't be daunted by all those terms. Read it one by one and it is easy to understand. The terms become more specific from left to right. For example, R* is the prerequisite for all terms to the right of it, and fp is the prerequisite for all terms to its right, and so on.

I have no argument with the Drake equation in that I believe it correctly represents the problem. However, people have to make educated guesses about the values in the Drake equation in order to derive the final product, that being the number of technologically advanced civilizations existing in our galaxy, and I believe that people have absolutely no clue what values to plug in for these internal fractions and this can lead such a wide variety of values for the final outcome of the equation that the equation becomes utterly useless for finding anything useful out about the question it is attempting to answer. Notice that since the Drake equation is a product, if just one of these values is nearly zero, then it doesn't matter how high the rest of the values are, the final product will still have a value of nearly zero. That's how multiplication works. The parameter that I believe is practically zero is Fi, but that's just my personal opinion. It doesn't matter which value is near zero. I am sure at least of them must be, and the end result is the same. So why am I so sure one of these values must be nearly zero then?

What the opponents believe, the Fermi Paradox

Enter the Fermi Paradox. Physicist Enrico Fermi was actually a believer in ET and it is ironic that his question has become a primary argument against ET. He worked at Los Alamos and one day he just threw out the question, "Where are they?" The basis of this exclamation was that people had been toting the obvious existence of ET but that there was no sign of them. The reason this seemed so strange was that it is easy to calculate that if intelligent life did exist, it should most certainly be here by now.

Here's one way of breaking it down. The galaxy is approximately 100,000 light-years in diameter. Let's assume it takes ET the longest possible time to reach us, say from the opposite side of the galaxy. Let's assume that once ET started exploring the galaxy they expanded at a rate of approximately one percent the speed of light. Assuming they have the means to travel faster than this allows them time to stop along the way, settle down, and root at new worlds before setting off again. If you are going to argue that this is far too fast and that I should slow it down considerably, you should be aware that I am not envisioning air-filled balloon like starships lumbering their way through space by the most inefficient means possible. By the time we are expanding outward, we will not be humans in our present form. We will be much more efficient robotic beings. The same logic applies to an advanced ET civilization. For more information on what I believe we will become in the near future, I refer you to my other mind ramblings topic, Robots and Mind Uploading.

So this means the travel time across the galaxy is ten million years. The universe is around 13 billion years old and the Milky Way has been in full swing for some considerable fraction of that time, say 10 billion years. So, take the travel time, 10 million years, and divide it into the galaxy's age, 10 billion years. You get 1/1000th. Now, assuming ET does exist, we presently live in one of three time periods: ET has not yet arrived, ET is in transit (in the process of expanding into the galaxy), or ET has already arrived (has already finished expanding and is essentially everywhere in the galaxy). The odds of us being in the in transit time period are one out of a thousand. We can assume we don't live in the post-transit time period because there don't appear to be any signs of ET. So that would mean we are in the pre-transit time period. In other words, they have not yet reached the point in their evolution where they become technologically advanced enough to explore space. That means we are alone as a technological civilization since the original question was, how many are there, and I have just concluded that there are none besides ourselves.

Counterarguments to the Fermi Paradox

There are many counterarguments to the Fermi Paradox. For example, one factor in the Drake equation involves how long a technological civilization lasts. The point this factor is making is that advanced civilizations may destroy themselves. This possibility was probably raised because our own nuclear standoff seems to have come so close to eradicating us. The conclusion is that there may be many civilizations out there but they don't last long enough take over the galaxy. Maybe, if we can avoid destroying ourselves, we can go out there and meet them someday. It does give you some hope doesn't it?

Unfortunately, it is false hope. For example, a civilization will have a much harder time destroying itself once it lives on multiple worlds or lives in space itself. A simple asteroid impact or large-scale war may wipe out one planet, but the civilization will survive because its members continue to exist elsewhere. Perhaps in the nascent stages of such an expansion, longevity isn't guaranteed, such as an Earth/Mars civilization, because a relatively nearby Mars society could be drawn into the civil strife caused by a war back on Earth, but as the global civilization continues to expand, it becomes infinitesimally unlikely that every single society in a civilization would be drawn into a conflict and be destroyed. If we inhabited hundreds of nearby solar systems for example, it would be difficult for a single conflict to erupt that would encompass and destroy everyone. The distance is just too great.

Perhaps these civilizations are wiped out by a plague that spreads throughout its distributed populations. Again, I argue that a civilization will spread in an increasingly disparate manner. The number of distinct locales of life in an expanding civilization will rise exponentially over time. Start on one planet, then two or three, very quickly several solar systems, and subsequently large fractions of the local galactic neighborhood. A plague would have to catch up with and overtake every single exanding population faster than the populations expand themselves. This seems practically inconceivable to me. Besides, life appears to get along just fine on our plunky little planet with all kinds of plagues. What sense does it make to assume that a superplague capable of destroying all life exists in the first place? The suggestion has been made that this plague may be memetic in form. In other words, it may be an idea that spreads and somehow infects and destroys populations. This seems kind of silly to me. It suggests that there some sort of perfect idea, that once conceived, convinces everyone to partake in his or her own demise and species extinction.

Another counterargument against the Fermi Paradox is that all the ET civilizations may purposefully be hiding themselves from us. For one thing, if they are bent on hiding themselves and they are vastly superior to us, then SETI is surely promised a dismal failure because they will succeed in hiding themselves. Regardless, I still doubt this is the case. Of the multitude of civilizations out there, only one would have to express an interest in contacting us and we would know about it.

Perhaps they don't specifically hide, but they just xenophobically stay at home, maybe living in their solar system and a few nearby solar systems. I say the same thing I just did. It would only take one civilization to reach out, and we would be shaking their hands as we speak.

Strengthening the Fermi Paradox through perspective on human history

It is possible that the various arguments against the Fermi Paradox are valid. For one thing, my counter-arguments are generally of the style that it would take only one civilization in a sea of civilizations. This is arguing the odds and statistics as a method doesn't work very well with low numbers. For example, if there are only two or three civilizations, then maybe they really did all choose to stay at home. That is why it is necessary for me to bring up a different issue altogether: Earth's history. Earth is the only example we have of life and humanity is the only example we have of intelligent life. While it is difficult to predict patterns from a sample size of one, I believe our own history offers some powerful insight into the notion of ET. Once humans emerged on the scene, it took us a scant 50,000 - 80,000 years to develop into our present technological form. It would appear that once an evolving species breaks a certain barrier, it practically explodes with ingenuity. Homo erectus didn't quite make it to this barrier. These hominids were some of our direct predecessors and were the most intelligent organisms to ever evolve on Earth prior to Homo sapiens and possibly Neandertals. Homo erectus could build simple tools, suggesting an inkling for technological prowess, yet they stagnated for almost a million years with their basic stone tools and never developed further.

However, when we showed up, the pattern is undeniable. Our technological evolution followed a standard exponential curve which means it started pretty slow, but it rose steadily, and as with all exponential curves it has a break-point, in front of which development is still rather slow, and behind which development takes off in an almost incomprehensible fashion. Humans appears to have approached and just passed through that point in the last one or two centuries and we are poised to go ballistic in the near future. Our technological prowess seems untamable. There is a force behind it that appears to propel it by fact of its sheer existence. For further details of what I believe is going to happen in the next century, I refer you to my other mind ramblings topic, Robots and Mind Uploading. For now, let me just say, the real show is about to begin.

The point I am making is that I believe humanity is about to take over the galaxy. We are at the very beginning of that ten million year expansion I mentioned earlier, and humans in particular seem to be so utterly efficient about territorial expansion (for better of worse), we may take over the entire galaxy in a fraction of that time, possibly just one million years. If human history is any indication, there is a drive for technological civilizations to spread.

It may very well be totally illogical to suggest the idea of an advanced civilization that chooses not to expand. This is akin to choosing to stop further technological, exploratory, and scientific advancement while it was such drives that made a technologically advanced civilization in the first place. A civilization that is prone to not expand is likely not to have become advanced to begin with. There seems to be something of an oxymoron in the suggestion that a tremendously poweful civilization with all kinds of technological and scientific knowledge would choose to suddently halt its own advancement, its own evolution, its own development. There have been a few examples of this in Earth's history however, ancient China being one. The Chinese were the most powerful society on Earth but suddenly chose to turn their ocean-sailing junks around and stop exploring. Did humanity as a whole stop expanding? Not in the least. The Europeans took over and became the dominant power in the world as a result. The same would be true of ET civilizations. Those that don't expand will by definition be the weaker civilizations. Evolutionary pressure will thus drive most if not all technological civilizations to expand as quickly and thoroughly as possible, but nare a peep has been heard so far.

Another interesting point is that from the onset of intelligent life to the breakout into the galaxy appears to have taken us less than 100,000 years total. If there were ET on other planets that were still evolving technologically, the logical conclusion is that they wouldn't take much longer than us. This would mean to suggest that we live in a microscopic 100,000 year window in which another civilization exists but has not broken out yet. 100,000 divided into 10 billion is 1/100,000. That is the chance that we coexist with another presently evolving technological civilization. In other words, not only are there no technological civilizations presently here, and no technological civilizations presently expanding into the galaxy, but there are also no presently evolving technological civilizations that we might meet after we both begin to expand outward.

What does this contribute to the Fermi Paradox? It argues that once a technologically advanced civilization emerges, it is practically inevitable that the civilization is, at that moment of its emergence, only ten million years away from completely saturating the galaxy with its presence, and yet we see nothing.

ET may still exist outside our galaxy

Perhaps you buy my arguments, perhaps you just think I'm a pessimist. I am certainly not a pessimist. The idea of what I believe humanity is going to become and will accomplish in the near future energizes me. This is not a pessimistic attitude to say the least. It does sound kind of pompous to suggest that we are totally alone though doesn't it? Well, that's not what I'm saying at all. I believe quite thoroughly that we are alone as an intelligent technological species in the Milky Way galaxy.

However, I do believe that it is quite likely that our galaxy is running amok with interesting biology. Discovering life on other worlds, be it micro-scopic, single-cellular, multi-cellular, plant-like, or even animal-like, will be one of the most exciting endeavors of our existence. The idea of seeing and learning about how life works on other planets and moons sends shivers up my spine. I cannot imagine a more exciting way to spend my time.

At the same time, I allow plenty of room elsewhere in the universe for intelligent life. There are literally hundreds of billions of galaxies in our universe, far far far greater than the number of stars in our galaxy. I permit for intelligent life to have evolved in practically all of those galaxies. I am allowing many billions of super-advanced civilizations to exist. The reason for this is that while the universe and our galaxy are old enough that it is inevitable for ET in our galaxy to have visited us, the universe is not so old that the same inevitability applies to distant galaxies. It is questionable whether it is even possible to travel between galaxies. The distances are just so immense. Perhaps nearly adjacent galaxies can be visited, but the idea of expanding into the universe is quite different from the idea of expanding into a galaxy. Maybe such a mission is possible, but it would require so much time that it is entirely probable that we live in a time and place that has not yet been reached by those civilizations.

Afterthought, an alternate take on the whole issue

Now that I have thoroughly defended my opinion that there is no intelligent life in our galaxy, I will propose one theoretical scenario in which I may be wrong. In other words, I can conceive of a realistic and possible scenario in which there are ET in our galaxy and yet there is a logical explanation for why we have not seen them yet and may never see any evidence that they exist. I will first refer you to my other mind ramblings topic, Robots and mind uploading for an explanation of where I believe we are headed in the future. There are two main points to be made here. One, we will be, for all intent and purposes, immortal. Our "bodies", which will be robotic, will last for extremely long periods of time and will be fully replaceable. Two, we will be robotic, not just our bodies, but our minds as well. This will allow perfect virtual reality. No heavy goggles and headphones, no computerized gloves. We will simply plug virtual reality into our senses and experience an alternate physical existence that will be totally real to us despite its absolute artificiality. It is possible that, as technological species gain this ability, they retreat from true physical reality into a much more pleasing virtual reality.

On the individual level this virtual reality would be more appealing because it could be forged to our will. The argument that we prefer true reality because it surprises us doesn't hold either. Virtual reality can easily be programmed to produce "places" that we don't know about in advance that we can then explore. We might even be able to program our minds to temporarily forget they have an alternate truer physical existence, just for the sake of experiencing the virtual reality from within. We might even be in that state right now, waiting to wake up when the alarm goes off. Pretty wild, huh?

On a larger civilization level, it should be possible to network everyone's minds together in any way that is desired. This allows more versatile communication, and in the end, more personal relationships.

It is possible that the allure of such an existence, when compared to static and unimprovable real reality, is a completely totally all-superior force. It may be true that no advanced species can resist this temptation (and why not, it doesn't sound bad does it?) and that consequently all the advanced ET civilizations out there consist of permanantly hibernating minds. Perhaps the planets that these beings live on are protected by ever-evolving, ever-improving robotic sentinal armies that ward off invaders and keep every individual's mind humming along nicely by replacing computer components whenever necessary. Maybe all we would find in exploring the galaxy is planets like this, hidden under unpenetrable defense systems with no interest in meeting us because they have created a replacement reality that suits every conceivable need, including curiousity, that they could ever have. Perhaps we are destined for the same fate. Perhaps we won't venture out in the universe because we too, in the very near future, will attain phenomenal virtual reality and will consequently simply shut our doors and go to sleep literally forever.

Whether this scenario counts as pro or con ET depends on your point of view. Strictly speaking in such a scenario ET exists, right? However, these beings will definitely live an extremely xenophobic and harshly defended solitary existance. It will be dangerous to exit conscious oversight of the present universe because invaders could arrive anytime and these beings will literally be asleep at the wheel. It is possible that confronting such beings would not only be dangerous (because their defensive systems may defend very very harshly) but might also be entirely futile. With a perfect fantasy existence at their beck and call, they may have no interest in interacting with us. Picture someone high on the most pleasing drugs we have, drugs like heroin. While under the influence of such euphoria, the only thing a person wants is to be left alone to enjoy the sensation. Nothing in dismal grayscale reality can compare to the wild appeal of drugspace. So do these ET count? We can't communicate with them, we can't learn from them, we can't trade cultural or technological currency with them. Plus it is possible we are on the same path and will become sleeping beauties ourselves, in which case we will close ourselves off and consequently never meet them, isolated islands of dreaming minds. Does this count as a galaxy populated with life that is waiting for us to explore and meet it that we will eventually explore ourselves? Not really.

Footnote 1
Added October 2011

While this article makes practically no direct reference to SETI, it does mention SETI in the subtitle and in such a way as to suggest that SETI should not be pursued. I must confess, I never really intended the article to be taken that way even though it is easy for it to be intepreted in such a fashion. The gloriously tongue-in-cheek wording of the subtitle obviously doesn't help my cause. This footnote can only be fully comprehended after reading the article in its entirety. Given that caveat, let me clarify my position on SETI here. I am dubious about SETI's prospects for detecting ETI. However, at the same time, I am fully in support of conducting SETI projects. I realize that such a position seems inherently contradictory. The thing is, I believe SETI serves many other purposes besides merely searching for ETI. It inspires generations of children to fall in love with science in general and astronomy in particular. It inspires long-term thinking about the course of humanity's future, and long-term thinking is in desperately short-supply in our reality-TV and fossil-fuel driven society. The data accumulated by SETI can be of use to astronomers for other projects. SETI is, after all, basically a survey science in which large volumes of data are gathered by observing the universe around us. It seems obvious that such data should be useful to radio astronomers and cosmologists without direct application to the issue of technologically adroit aliens. Lastly, I would readily admit that SETI can only be described as succeeding or failing to find ETI if the search is actually conducted. While a crucial point of this article is that such a search should not necessarily be required to establish the existence or nonexistence of ETI (because their presence should be obvious regardless of SETI), there always remains the possibility that ETI does exist but in such a fashion that it lies outside the current detection abilities of humanity. Under such hypothetical conditions, the best way to improve our knowledge of the situation is to actually conduct the search. Thus I support such endeavours despite my apprehension about their expected success. Finally, SETI is so cheap, and we waste so much money on unbelieveably unimportant things like football stadiums, that I think the money should be spent and the project should be conducted simply because the inspiration it represents to our society so vastly exceeds its incredibly meager cost.

I would really like to hear what people think of this. If you prefer private feedback, you can email me at kwiley@keithwiley.com. Alternatively, the following form and comment section is available.

Comments

Name:
Comment: characters left

(Html tags will be intentionally stripped for security reasons, sorry.)
Verification: = (solve the equation, don't just duplicate the text)

Name:Keith Date/Time:2011/08/25
NOTE THAT ALL COMMENTS OLDER THAN THIS ONE PREDATE THE COMMENT SYSTEM. They originated as email feedback and have been retroactively converted to public comments to seed the new comment system. As such I have redacted them where appropriate for the purpose of preserving their anonymity.

Name:Anonymous Date/Time:2007/03/18
Hi Dr. Wiley,

I read with great interest you paper on Aliens, UFO, SEIT. You asked the readers to comment. Therefore, I would like to share with you an article I wrote recently on the subject from the Islamic point of view. I would appreciate your feedback.
[...]

Name:Anonymous Date/Time:2005/08/03
DEAR KEITH,

I FIND THE DRAKE-FERMI DISCUSSION WALKING THE YELLOW HIWAY LINE BETWEEN SCIENCE AND RELIGION. BOTH SCIENTIST AND PRIEST SAY WHAT THEY BELIEVE, NEITHER KNOWS. THE FIRMAMENT REMAINS A PLACE OF WONDER AND MYSTERY FOR THE REST OF US.

NO PERSONAL CRITICISM (NEGATIVE SIGN) INTENDED

Name:Anonymous Date/Time:2004/04/24
Another alternate take on the possibility that there are millions of other forms of intelligent life in this universe is something that one might call "higher" or alternate "levels" of existence. You touched on one interesting alternate with your VR dream state idea.

What of alternate levels that humans can not observe?
For example: Allow for theoretical energy beings existing at a higher "vibration". "Out of phase" to what can be detected with current instruments.
Such beings could be living right here on earth, only at a higher/lower energy density. You are probably pulling a face about now, but bear with me.

So the question should be, why aren't there any observable extraterrestrial activity? Maybe the answer is simply that humans do not have the means/senses to observe such activities - at this time (im an eternal optimist).

It could be that physical immortality is not the be all and end all. Maybe the physical "level" is just the beginning of life. Maybe the natural cycle of the universe is for a being to die and move on to the "next level". (Religions call it heaven/hell/nirvana - whatever, it is one more cycle of life)
Think of the universe as a massive VR simulation with many, many overlapping programs running at the same time - what humans experience - the "physical" - is a mere fraction of the whole.

The "higher/lower" vibration idea comes partly from string theory, where the strings' specific vibration determines the properties of a particular particle, or some such.

The way all this ties in with your VR idea, is that the act of lucid dreaming (or direct-to-mind-VR or alternate consciousness or whatever you want to call it) could be one way for physical beings to contact such higher levels of existence.

As long as scientists keep their minds locked in the physical, they will never be able to know about anything outside of "level one".

Yes, the idea is very metaphysical and not something a scientist would buy into, as it is simply improvable at this point in time.
I still think it is an interesting concept though.

Name:Anonymous Date/Time:2003/05/17
hi keith

i have just read your article with interest; i am no scientist, and the process you use to arrive at your desired conclusion is straightforward, logical and well reasoned.

This does not, however, make it correct ;)

you have made so many assumptions upon which to base your view, all understandable ones, but without laboriously making the same point repeatedly i will say this:

all the assumptions in the drake equation, and about the relative speed of a civilisation's advancement, the direction of development and the desires of said ET race, all your points bar none rely upon the simple premise that

'our science explains our development in these particular terms, therefore any alien developement must be understood in these terms'.

why, exactly? your case is clear and well-reasoned, and these tools we use to understand our world are extermely useful, necassary to our development, even.
but just because intelligent life has formed in such a way here, why should ANY of it follow for other beings? think about it.

there may be forces 'alive' which have no 'objective reality' currently understood

there may be means to develop intelligence absolutely different from our own

there may be ways to travel incomprehensible to us

(heres a classic one) they may be here already!

i could go on, but you get the point. i reckon all my speculative ponderings have the same weight as your logical fortifications. and thats saying something, right?

now i realise im in all sorts of trouble with this line of argument, and that a certain david hume got caught out a bit by the old

'how do you know the sun will rise tomorrow?' debate, but still, im sticking to my guns!

so let me attempt a synthesis here...

All life as we know it is unlikely to exist on any other planet in our galaxy, using the rational tools at our disposal.

If we accept, however, that those rational tools are ill equipped to actually deal with the question, the possibility of life alien to us is absolute.


Thanks for an interesting article keith; time for me to run for cover!

Name:Anonymous Date/Time:2001/11/11
Keith,

You presented some very plausible arguments against the tired Fermi's Paradox crap. I've got a little something to add. I believe there could be other life right here in our own solar system, but I propose another reason for not seeing the evidence.
Consider that radio signals travel roughly at the speed of light. Even if ET were as evolved at least as much as we are, imagine what we're asking here! Assuming that even the next nearest star had life on one of its planets ten light years from here, if someone shouted into a microphone, "Is anyone out there?", you would have to wait twenty years for a response, assuming they are tuned to the correct one of the millions of possible frequencies, using the same basic equipment we do, and communicate the same way.
The chances of this happening are slimmer than hell. The speed of light could very well be the natural speed limit of the universe. Thus it can be that geographical distance is why we aren't hearing anything.