As the few of you who have followed my blog might know, I haven’t posted anything in over a year. I don’t have a special explanation for this beyond that I just didn’t feel like working on something. Writing is not particularly easy work for me. For a while, I told myself I was working on a longer work and true enough I have been writing on something longer or rather more precisely several longer pieces. I would start one, grow dissatisfied with it, start another – you get the idea. Some of this writing may eventually appear in some form but most of it will go by the wayside to be stored on some disk drive that eventually gets destroyed under one circumstance or another. To shorten the story somewhat – let me say I am back posting and will try to be more regular about it, at least once every month or two.
Back in June I was strongly tempted to post something on the big Anonymous claim that NASA was about to announce the discovery of extraterrestrial life. I didn’t believe the claim for a moment. I don’t think NASA would hide the discovery of extraterrestrial life. They might hold off an announcement until they could confirm it beyond reasonable doubt but not hide it. If anything, with our science fiction and movies, we are more than prepared to accept that life (even intelligent life) could exist elsewhere other than Earth. There would be no reason to hide the discovery because of its culture shock impact. They wouldn’t withhold it so NASA could gain some secret technological or military advantage either. Aliens aren’t going to come here to do “deals”, even “big deals”, with us. If they were smart and benevolent, they would probably withhold their technology from us – prime directive sort of thing – and maybe even hide themselves from us. If they were not benevolent, we would never know what hit us before we would be gone.
So, the aliens still haven’t arrived and probably won’t be arriving any time soon, otherwise we would have probably already spotted some evidence of their existence. Where are they? The Fermi Paradox again.
An emerging meme is that technological civilizations destroy themselves by destroying their environment. Some want to bundle climate change and the Fermi Paradox to explain why no other technological civilization (of which there must be or have been many) has spread itself far and wide in our galaxy. I am not buying it. If we want to go down that path, I still think the nuclear war scenario would be far more destructive and far more likely to result in our extinction. Don’t get me wrong. Climate change might eventually put Miami underwater but the people who are there will just go elsewhere. The runaway greenhouse effect (the Venus scenario) isn’t happening. We are too far from the Sun. Putting aside stronger hurricanes, sea level rise, and some species going extinct, things are improving. Alternative energy technologies are increasingly cost-effective and many of us may live to see the time when almost all vehicles are powered by batteries charged by the sun.
So where are the alien civilizations?
Part of the answer, I think, is to be found in Nick Lane’s book The Vital Question. Life established itself on Earth relatively quickly, possibly almost as soon as the Earth cooled enough to have liquid oceans, or at least within a billion years of it. The thermal vents look increasingly to have right physical structures and chemical characteristics to create life. Since these conditions are probably common elsewhere in the universe, life in some form likely is abundant elsewhere. On the other hand, complex life required almost another three billion years before it established itself. Complex life has been around on Earth for probably less than a billion years out of the four and a half billions of years since Earth formed. To get complex life, among other things, you basically needed to have one bacterium assimilate another bacterium and create a genetically stable organism with mitochondria. Without mitochondria organisms are unable to harness sufficient energy to create complexity. This must be difficult and very random or it would have happened sooner on Earth.
Even after we get complex life, we still need to go through a whole other series of advancements to arrive at civilization, our civilization. To get civilization on our planet, we had to oxygenate the atmosphere, move out of the ocean, and then we had to go down the big brained primate path to an ape that began to walk on two legs and use its hands to make tools. How likely was that? All the time we were evolving our planet had to have been relatively stable, not hit by a giant asteroid, not bombarded by gamma rays from a nearby super nova, or suffer some internal geological calamity.
Could aliens create a technological civilization without any appendages whatsoever capable of manipulating the environment? Technology begins with manipulating and shaping the environment. It is certainly true an advanced technological species could manipulate the environment with technology itself. We, in fact, do. The question, however, is how does the capability evolve in the first place. Many species on Earth can create tools or use the environment to their advantage – birds, other apes, insects to name a few. However, none so far have been capable of the degree of manipulation that our distant ancestors possessed. We like to think that we make things because we are smart but it might be we are smart because we started to make things.
Scientists often caution us about making no assumptions about how much like extraterrestrial intelligent life would be to us. We shouldn’t expect alien intelligent life to look like Romulans or Klingons. Yet when we also ask where are the alien civilizations, we are assuming that extraterrestrial intelligent life would be very much like us in the aspect that makes us most human – our long evolutionary history of manipulating the environment and making sophisticated things. How many billion years of good fortune on a habitable planet does it take to make a creature that does what we can do?
I think the odds are that the aliens aren’t here because there are not that many advanced civilizations who could ever get here. And that, I think, makes us very special.
This has usually been my view in regards to the Fermi paradox. There’s an inherent assumption that an “advanced” alien species would act like or similar to us with it’s desire to manipulate the environment and explore outside of it’s planet. It very well may be that alien species usually just don’t act like us. One can imagine a more “plant” based species that functions like a collective hive mind, communicating amongst itself through an organic internet in a planet wide “forest”. It may be advanced in one aspect, but it wouldn’t be a species that would reach out and contact us or explore outside of it’s planetary habitat (or may not even be able to). I hope this makes senses. Been a long time since I’ve read your blog. Hope you’ve been well.
Makes perfect sense and not too different from what I am saying.
Thanks for commenting.
Hmmm…. throwing out some more speculations, if you don’t mind. Maybe, going off of Hollfman’s proposal that evolution created our senses to be useful and not accurate, maybe it’s possible that an alien species with a completely different evolution would be unable to communicate with us in any way that we would understand? Or maybe they’re so advanced that communication is impossible, like us trying to communicate with an ant (do ants know that humans exist, or are we just just masses that get in their way sometimes?). Maybe aliens HAVE been communicating with us, we’re just so completely different that we can’t read it? I don’t know, just throwing some more ideas out that go beyond the “aliens all get too advanced and kill themselves” or “we’re the only advanced species in the universe”. Apologies for the ramble.
I assume you have seen the illustration showing the extent of the penetration of radio waves into our galaxy since we invented radio. It is a small bubble in a large galaxy. Unless some aliens had penetrated that blue bubble, there would be exactly zero evidence available to them that we are here. And to pull that off, they would have to be in our galaxy, one of several hundred billion galaxies, at this time in the 15 billion year history of the universe. There could be hundreds of billions of intelligent alien species in the universe and we would have no way of knowing.
here’s the illustration https://www.reddit.com/r/space/comments/2kjboc/the_extent_of_human_radio_signals_into_the_milky/
Yeah, it’s a big universe out there!
Still a lot stuff has to happen to achieve a technological civilization. So I would say there are probably some other technological civilizations out there now or were out there at one time, but I doubt it is as many as I once thought.
D’accord! I’ve long thought an accurate analysis of the Drake Equation would result in a probability of perhaps even slightly less than 1.0 of any given galaxy having an advanced technological civilization capable of colonizing said galaxy. So far it doesn’t appear this galaxy has one. If the odds are as low as I suspect, then that’s it. We’re it (maybe; remains to be seen).
There is also that, at 13.8 BY, we’re actually pretty early in the full history of the universe. If you grant a one-trillion year span, we’re in the first 20 minutes of a 24-hour day. So maybe we’re just the first. We’re “The Ancestors” other races will be talking about in hushed tones billions of years from now.
It’s not just the mitochondria. It looks like having a big tide-making moon might be instrumental in leaving the seas. Tide pools providing wet-dry environments that offered a new transitional niche. And maybe having a pair of big gas giants in the outer system shields a developing Earth from being pounded to pieces. And being near enough an ancient supernova of the right kind to provide the heavy elements.
So many factors added up to produce us… it’s kind of amazing. We’re damn special!