10 Ways SETI Might Detect Alien Civilizations And What They Might Be Like


One of the biggest problems facing the Search
for Extraterrestrial Intelligence is that we really have little idea of what one would
look like. This makes the prospect of detecting them
difficult, after all, how do you look for something that you haven’t ever seen before? But there are clues, mainly based on things
our own civilization does, or could do in the future that gives us at least some kind
of insight on what to look for as far as an exocivilization is concerned. Almost invariably, this involves detecting
their technology. So here are ten ways we might spot an alien
civilization based on their technological activities and, as a result, what they might
be like. Number 10. Dyson Swarms and Energy Collectors If we ever detected a Dyson swarm, which is
possible through studying the light curves of stars, it would indicate a very energy
hungry civilization. The idea is to build solar energy collectors
in space to collect as much energy as possible from a star. The amount of recoverable energy from a star
is mind boggling; far, far more than we currently as a civilization can even dream of needing. So if we did detect this, it would be a civilization
of immense power. If they could direct all the energy they were
collecting from a star, depending on how much of it they were collecting, they could devastate
entire planets from light-years away. They would also have immense amounts of energy
for use in computing or space exploration or very advanced scientific experiments. But it may also be that because we haven’t
yet seen any indication of this kind of a technosignature, it could be that no civilization
ever needs this level of energy generation, much less than the available energy of an
entire galaxy as in a hypothetical Kardashev Type III civilization. Number 9. Odd Chemicals in their Atmosphere This option may indicate a civilization that
doesn’t really have that much energy, and in fact it may possibly indicate a civilization
that’s in trouble. The case can be made that any advancing technological
civilization will deal, at one time or another, with climate change and the addition of industrial
chemicals to atmospheres, such as CFCs. We ourselves have done this, and this could
be a common consequence of advancing energy production and industry, where they’ve pushed
their home world just a bit too far, and as a result have to mitigate climate change artificially,
something that we may well have to do. But the opposite may also be true. Civilizations may also intentionally terraform
their worlds through the introduction of artificial CFCs as an aid to induce a powerful, very
fast greenhouse effect far more efficiently than gases like carbon dioxide can do. This would be an easily detectable technosignature,
and would also be one of the few dead ringers that indicate the activities of an alien civilizations
as opposed to anything nature would produce. Number 8. Outgoing Aliens In SETI, the greatest hope for discovery is
something that’s easy to detect from proactive aliens that want to be seen. One way this could be done is if an exocivilization
has built a huge, unambiguous radio beacon that blasts out the interstellar equivalent
of screaming hello. But that’s not a cheap way of doing things,
and it’s not the only way to create visibility in the galaxy if your aim is to deliberately
be discovered by other civilizations. If one wants to be the life of the party in
the milky way, cheaper possibilities might be to construct giant objects in your star
system that transit across the face of your star, such as a louver arrangement advanced
by astronomer Luc Arnold, or a huge opaque triangle or other such shape that nature simply
would not produce in a solid object, thereby informing the rest of the galaxy that they
are not alone if their astronomers are studying photometry, as ours do. Other hypothesized methods of saying hello
include adding unusual elements into a star, such as plutonium, that at least as far as
we know, do not normally occur in nature in large amounts, though this is now debated. An example of this is Przybylski’s star,
which shows evidence of transuranic elements in its spectrum; were they put there deliberately,
or did this star get bombarded by a neutron star relatively recently, thereby providing
a way for transuranic elements to exist naturally in a star. No one knows, but there’s also currently
no sign of a neutron star in the vicinity. But would those kinds of technosignatures
actually say hello? Might such a civilization not be the life
of the party, but something much more grim. The case could also be made that a civilization
building enormous Arnold structures might also be saying that they can build enormous
megastructures of unknown use, including those of a defensive, or offensive nature. Or what might Pryzbylski’s star say, if
the cause of that star’s odd spectrum isn’t some natural phenomenon that we haven’t
thought of yet, then is it a hello, or is it informing the galaxy that whoever might
be there has very advanced nuclear physics, enough to fill their star with plutonium. Imagine what a civilization could do in a
situation of warfare. One man’s hello in the galaxy, might in
fact just be a warning sign for everyone to stay away. Number 7. Star Movers Seemingly one of the biggest projects one
can do in this universe on a galactic scale is move stars around. While this may seem to be an impossible task,
it might not be for a highly advanced exocivilization. One concept for moving a star is called a
Shkadov thruster and essentially involves the construction of a partial dyson sphere
to reflect radiation pressure from a star unevenly to create thrust. This then, over time, will move the star to
wherever you wish it to go. This is of course a highly speculative technology,
and suffers from many of the pitfalls of a full on Dyson shell around a star; how does
one engineer a structure like that? But if it is indeed possible to do it, then
moving stars could have significant advantages for an exocivilization. One of these would be to arrange stars, you
could arrange them into ideal positions to facilitate travel between colonized systems,
or move passing stars in for colonization as needed. It’s hard to say what the cost vs. benefit
of such an undertaking would look like, but it is in principle possible. This would also be readily visible as a technosignature. A huge shkadov thruster should be readily
evident in a light curve for example, as would oddly moving stars in general, or stars arranged
in, say, geometric positions. And there is one last possibility that might
raise some eyebrows, and make a bit more sense as far as the use of Shkadov thrusters go. Clearing your galaxy of dangerous stars. Giant stars tend to live short lives and come
to violent ends and can affect nearby inhabited systems. An option for a galaxy spanning type III civilization
to mitigate this might be to eject these kinds of stars from their galaxy, or engineer the
stars themselves to be less of a threat. Either way, this would create a galaxy strangely
devoid of certain classes of star, and leave it reddened in emissions. Such galaxies are known, but there are a lot
of natural ways this could happen as well. At any rate, such a galaxy may show no other
signs of being inhabited, this would be SETI at very long distance, but the idea of a civilization
managing galaxy is at least an interesting one. Number 6. Planet Protectors Management of a galaxy would be a truly monumental
undertaking by an undoubtedly highly advanced civilization that would possess technologies
that might be, by our standards, incomprehensible. But there are other ways to make a civilization’s
home star system safe from any nearby unstable stars or other such threats, if they set their
sights only on that system. And the ability to do that on the level of
a single star system may not be that far in our own future, at least as far as hypothetical
capability is concerned. The most obvious problem with our own solar
system, and very likely many others in the Milky Way, are the threats posed by asteroids
and comets. Impacts have certainly happened in Earth’s
past, and even humanity’s past. Both Barringer crater in Arizona and the newly
discovered 31 kilometer crater buried under Greenland’s ice hit well within human prehistory,
though it’s unlikely either one was actually witnessed and it’s not certain what effects
the Greenland crater in particular might have had on earth’s climate. But with proper observation these sorts of
collisions can be avoided, and even current technologies are plausibly able to nudge asteroids
around so long as we know they’re coming well ahead of time. Seemingly, this would be something alien civilizations
would be motivated to tackle as well, if they too face that kind of threat. But another threat they might face is that
of a supernova, or a gamma ray burst. While these threats, at least as far as we
know, don’t pose too much of a risk to earth, though there is a chance the destruction of
the star WR104 might in the future, civilizations nearer to the sources of events like that
might be in serious danger. But, threats of this kind might be mitigated
by an exocivilization through building an orbital blast shield to protect their planet. Accomplishing this would not be dyson sphere
level technology, rather it seems more doable as an orbital shield. And, other problems, such as stars that increase
in luminosity as they age, such as our own sun, could be addressed by using star shields
to control the effects of that, at least for a time. Any of these hypothetical solutions should
in principle be detectable as technosignatures in light curves of stars and transiting planets,
and any civilization employing these techniques may not be all that more advanced than we
are in that we would probably know what they were doing if we ever saw this kind of activity. Number 5. Planet Migrators If this technosignature was ever seen, it
seems likely that it would come only from a very discrete civilization that doesn’t
really make itself known any other way. It’s the concept of planetary migration,
and such a civilization might live out most of its existence as an earth like civilization:
biological, technologically advanced, but they otherwise never really leave their star
system for lack of any reason to do so, after all, colonizing a galaxy is an expensive endeavour. Some may simply choose not to bother. But such a civilization couldn’t exist indefinitely;
star systems like ours are not static things, instead they are dynamic long term. And like our own sun, there would come a time
where a civilization must mitigate the effects of their changing star. One way to do this would be to very slowly
migrate their planet to a more suitable orbit as their star changes, perhaps in conjunction
with star shades. This would be a very long, drawn out process
whereby objects, such as large asteroids, are orchestrated to pass by a planet over
the course of potentially millions of years to slowly tug that planet further from its
parent star centimeter by centimeter, as the star undergoes it’s changes long term. To spot this kind of activity, we would need
to be watching a star system periodically for millions of years, but after that amount
of time of observation, the deliberate migration of such an observed planet should be readily
evident. 4. Star Ticklers We often envision alien civilizations as spanning
the galaxy, or at least an empire of star systems within it, expending enormous amounts
of energy on starships and communications. But this may not be how it actually would
be, from a practical standpoint. Instead of building empires, civilizations
might simply choose to improve their own star system and never cross the vast distances
of space because it’s simply too expensive to mess with. Or they may found a few colonies in nearby
star systems and simply stop when they’ve concluded that they’ve gone far enough with
their real estate portfolio. This pragmatism could extend into other areas,
such as sending out SETI signals. If a civilization really wanted to contact
other civilizations cheaply, and easily and using little energy, one way to do it would
be to just mess around with natural sources of light in such a way as to be identifiable
to other scientists in the galaxy as artificial manipulation. Examples of this might be to bombard a variable
star in such a way as to make it pulsate in an unnatural way, or timing a communication
with an astronomical event, such as a neutron star merger, that would be anticipated by
the rest of the galaxy’s scientists. Piggybacking a signal when the exocivilization
knows that everyone is looking, perhaps a better option in comparison to expanding the
energy needed to continuously transmit a signal. About all one could say about such a civilization
is that they are probably very smart with their available resources. Number Three. Terraformers. Finding and studying truly Earth-like exoplanets
is something that in the coming years promises to give us an unprecedented insight on habitability
within the Milky Way. Instruments like the James Webb Space Telescope
will expand our ability to see and study these worlds, and future instrumentation even more
so. As a result, we will eventually be able to
study habitable worlds in some detail. What happens if we begin to see patterns in
that data. Say a grouping of habitable worlds is found,
where one might find several, or even tens of habitable worlds clustered together in
a group of suitable star systems. An oasis of habitable worlds in an otherwise
sparse section of the galaxy. This could be due to chance, of course, but
it might also indicate a civilization that’s expanding out of their home star system and
actively terraforming suitable worlds in the systems around them. It would be difficult to pin this down definitively
to terraformers, but over a long period of time of observation these activities might
be detectable as they continue to expand and other habitable worlds begin appearing. Or, another possibility would be a habitable
planet with an unnaturally thick atmosphere that it otherwise should be too small to hold
onto, similar to a terraformed version of Mars, where long-term atmospheric loss would
have to be managed. Any civilization capable of doing this would
have had to master long-distance space travel, and would demonstrate very long term thinking
and planning. While they may not be a full on Kardeshev
Type III civilization, they would be still be highly advanced, and given that penchant
for long-term thinking, it seems likely they would be a stable civilization that might
last for a very long time indeed. Number Two. Von Neumann Bio Printers Ever since mathematician John von Neumann
first envisioned the concept of self-replicating machines, the potential uses people have thought
of for such machines has only increased in number. From nanotechnology that can self-replicate,
to exploring the galaxy efficiently at sublight speeds using such probes, it seems, on its
face, a natural thing for civilizations to eventually build. We see no such thing however when we look
to the heavens, since von Neumann probes that self-replicate without restriction would eventually
consume entire galaxies. We don’t see that happening in the universe. But that may not mean that such machines do
not exist, only that they are governed to prevent them from getting out of hand. But it still remains that self-replicating
machines are an efficient way to put a probe in every worthwhile star system in the galaxy. That said, life also is self-replicating. That’s biological reproduction, and it is
one of the absolute essentials for life. But biology is limited to the environment
it evolved in, and it’s hard to think of a harsher environment than deep space for
life. Ideas of panspermia within a star system are
still on the table, but interstellar panspermia seems less likely. A microbe surviving in a rock for tens of
years or so while crossing space is one thing, the same surviving for millions of years across
interstellar space is another. But would an alien civilization be able to
one up natural panspermia? Possibly. Von Neumann probes could, in principle, be
equipped with 3d printers of sorts. If a probe came across a civilization, or
otherwise interesting colonizable world, it might then be able to print out a copy of
a member of the biological species that sent it. That member could then make contact, or be
tailored to survive in the new planetary environment by altering its biochemistry if it were a
bit different than the conditions of the home world. In other words, the founding of colonies in
the Milky Way may not be a matter of biological life travelling at all, rather it may be machines
seeding new civilizations by simply printing them out. Number One. Living Machines This last option for speculating about what
an exocivilization might be like, is also perhaps the most alien. Biological civilizations may share some very
basic features, such as types of biochemistry, and convergent evolution where a similar outcome
might evolve between intelligent species due to the realities of existince. You can’t really be a technological species
without the ability to understand engineering and mathematics for example. But it’s also a distinct possibility that
civilizations may eventually forsake biology entirely, something glimmers of which are
appearing within our own civilization. And there are significant advantages to becoming
a machine civilization. One of these would be the ability to exist
effectively anywhere in space where resources are abundant and energy generation is easily
accomplished, and in fact even the cold of space itself is useful for a machine wishing
to calculate efficiently. But what might a machine civilization be like? There are many possibilities. A few of these would be a giant computer built
as concentric dyson shells to eek out every bit of energy possible from a star. This is usually termed a Matrioshka brain,
and would represent unfathomable computing power by our standards. Another might be self-aware conscious von
Neumann probes, or even shrunken civilizations making use of nanotechnology and the ability
to build small. In which case, how would you ever detect a
tiny exocivilization that doesn’t even need an entire planet? You probably couldn’t, and that brings up
the point that exocivilizations may simply be very difficult to detect, and the more
advanced they become, the more different they are. And the argument can be made that much like
a person in the middle ages couldn’t possibly have predicted what the world of today would
be like, we may in turn not be able to predict what we’re going to look like in a thousand
years, much less envision what an advanced exocivilization perhaps millions of years
older than us might look like. Thanks for listening! I am futurist and science fiction author John
Michael Godier currently wondering if exocivilizations might be more like us than many of us would
like. While it could be a noble universe full of
peaceful space faring civilizations, it might also just as easily be a universe where the
latest antics of Gorp the Attractive are streamed on alien internets along with cute pictures
of pets that would be deadly to humans should we ever try to pet them. Very troubling indeed and be sure to check
out my books at your favorite online book retailers and subscribe to my channels for
regular, in-depth explorations into the interesting, weird and unknown aspects of this amazing
universe in which we live.




Comments
  1. Always interesting John, thank you! Around 8 minutes in you talk a little about the newly discovered 19 mile wide crater in Greenland under the Hiawatha Glacier. You said the environmental effects of this are currently unknown, yet the comet is dated to roughly 11500-13000 years ago, which coincides with the Younger Dryas Climate change, sea levels rising, the extinction of woolly mammoths, North American lions, giant sloths, not to mention the exinction of the North American Clovis culture. I recommend this video by Bright Insight which explains the links further. https://www.youtube.com/watch?v=hMTTFLiOwX0

    Thanks John- you rock! Supermind is on my christmas wish list this year. Looking forward to reading it, and watching your later videos!

  2. So do people searching the skies with telescopes and other instrumentation totally dismiss the reports of high ranking government, military and airline pilots such as listed here https://www.richarddolanpress.com/twelve-government-documents ? Do they dismiss them as liars or that they are mistaken?

    The Iranian pilots were chasing and being chased by something like Venus? It was pulsating with a red light making circles. It had a radar signature comparable to a 707. It came at then chased them as they fled in their F-4s.

    Or is it more like, well that's the equipment we have access to, might as well have a look?

  3. Good list but you left out life is infinite, matter and energy are finite therefore we live in a "dark forest". Or, as an addendum to bio-printers, why not just create DNA variants that can survive on each planet in an unpopulated system and move on. You may go extinct as a species but you spread the possibility of life as far as you could.

  4. Think about this, it's 100 ACE and a Lenape Indian off the New Jersey shore finds a strange object wash up on the beach while collecting for fish. It looks like two wooden planks with iron nails through it. To us now that's not to strange but to him or her it's an alien object never before seen. We know now that that plank was from a ship wreck off the the coast of now England and the planks got caught in the ocean currents and washed ashore in the New World, but to the Lenape it's a mystery artifact.
    Now think about debris from another planet form another time drifting away to our solar system and maybe getting stuck in the asteroid belt, we may be like that Lenape finding those planks.

  5. Fascinating ! Now answer this question .Is knowledge unlimited or is it possible to know everything? I mean you have an unfathomably power computer will it reach the end of knowledge?

  6. Just like wind and water, and Sun energy on Earth. Ultimately, the Universe will provide a cheap and limitless power supply. Unless, we as a civilization recognizes the fact, that we will eventually destroy ourselves. If we keep this course. I think very few civilizations get past wars, hate, wasted resources or technology, before they commit suicide. So, that means that civilizations who do progress though it's own inherent prejudices. Will achieve an advanced civilization, capable of things that we can't even imagine at this point.

  7. SETI is never gonna openly say if they detect any alien civilizations, because every single time we see evidence of that, they say "its probably not ET's, that is too unlikely". The cigar shaped object passing our star, accelerating after it slingshot contrary to gravitational theory? "Probably not ET". The light dips in Tabby's Star, the irregularities and immensity of variations suggesting artificial structures? "Probably not ET". The "wow-signal" that still to this day has never once been repeated in any cosmic observations of any natural phenomena? "Probably not ET". Or how about the signals picked up from Tabby's Star, again patterned repeating signals unlike any previous natural signals ever detected, and never since that day repeated, a unique signal from a unique star with unique light dips? "Probably not ET".

    Its basically a paradox, they cant get evidence of what they're looking for, because they never believe its possible.
    No matter what evidence they discover, they will always conclude "probably not ET", just to be politically correct and safe.
    Because if they say "ET" and it's not, they're fucked, they cant handle that. So they will never say that unless they literally shake hands with one in their offices while sharing a mountain dew and hot dog with them. And good luck with that.
    Basically, SETI is fucked, they can't ever accomplish their mission, because politics and the scientific establishment doesnt accept the possibility. They "think" they accept the possibility, but they really deep down still dont think its possible.

    Thats why they completely ignore things like military jet radar & military base ground-radar tracks of the exact same objects doing 90 degree turns while going at mach 20. Because they still in their narrowminded heads dont comprehend that other alien civilizations exist, and have been EQUALLY likely to visit Earth at any point in the past 4 billion years, as "in the far future" when their locked mindset thinks ET's will be discovered. They always think its far in the future. For some reason, as if the universe was courteus enough to wait for them to become ready.
    The media astronomers always say "maybe in the distant future when another civilization makes contact with Earth".
    Not realizing of course, that the entire universe has already had 4 billion years of time to not only contact, but also visit Earth.

  8. If there's other life in our galaxy it would've colonized all star systems by now. So where is that life? I think we're the only life form in our universe and possibly even in our galaxy super cluster. Life might very well be so rare that there's no other life form in the observable universe. We might very well be the minds of the universe, a few humble smart apes with an entire universe for the taking.

  9. Put Superconductors In The Base Of Your Receivers, It Magnifies & Reflects The Megahertz FM Waves. Or You Could Call Yourself A Colossal Failure By Noticing Time Slows In A Wheel. You Seem Too Dense To Figure Out What A Saucer Is Or That The Atomic Clock Slows Every Time In There. You Make Me Sad, And Sick Because Of How Much Of A SAD Liar You Are About Aliens.

  10. Przybylski's star is such a fascinating enigma. Even if it's nothing to do with extraterrestrial intelligence, something really weird is going on with it.

  11. Aliens can:
    -Make giant objects orbiting their stars.
    -Make gigantic planetary shield
    -Fill up stars with plutonium
    -Move their home world.
    -Move their star.

    But they just can't achieve faster than light space travel because that's clearly far fetched.

  12. The Greenland 500 Billion Chunk of Iron hit 12,800 years ago and was the cause of the last great extinction. Fire was spread from the US to Syria. When you look at the side of a cliff in this area you will see 2 black lines. The lower one is from when the dinosaurs were extinct. And the top one is from the Greenland impact. A 500 Billion pound chunk of Iron traveling over 12 Miles a second. This is when the Sabertooth, Mammoths etc. Went extinct.

  13. You will attract what you put out. If you have fear then its possibly due to biased thinking because of social conditioning. Best wishes.

  14. ~There is no use to "find" something so unfamiliar to us anyways…
    and for Intelligent Life, it MUST be on our reach… it's useless to "find" something like a star that is intelligent but we can't even comunicate… Just like ants, they can comunicate and such with each other, but can't grasp on humans… and humans can study them, but never have a conversation anyways…

  15. How might SETI detect an alien civilization:

    "Hey 911, this is Bob from SETI. There is an alien standing on the rim of the obervatory telescope and he is pissing on our very expensive mirror."

  16. I find it strange how people love to cling to the thought of Dyson spheres/swarms as the "ultimate" form of energy generation. We now know that water is extremely common in the universe, and so I find it infinitely more likely that advanced aliens would use fusion reactors since they would have a practically unlimited source of hydrogen.

  17. Why should an alien civilization use radio waves to attempt to communicate? Aren't we assuming that a given species has the same sensory systems that we possess, and that they process stimuli and make ense of their environment in the same manner as we? Why should aliens use sound and visual stimuli to process information? Considering that they evolved from a totally different base species in a totally different environment than us, isn't it possible that they would have sensory means that are unknown to us?

  18. I love your videos!!! As a lover of sci-fi, I like how you connect the so called "fiction" to reality. Also you should do more crossovers with Isaac Arthur, I adored the video you two did together!!! Much love my dude! ^_^

  19. never read one of your books, no offence i never encountered them. but i gotta say your insight and depth of concideration of the possible unknown is refreshing to say the least

  20. Any such exocivilization will be morally incredibly far beyond humanity as it is now. We murder, we lead wars, we exploit our kin, we are not even able to unite facing the biggest disaster humanity has caused – in contrary, we keep speeding it up.
    Humanity is not even close to establishing "libertรฉ, egalitรฉ, fraternitรฉ" (you may also call it a working global communism).
    But getting rid of the "design flaws" homo sapiens obviously has is an absolute prerequisite to any advanced technological society.
    Any such extrasolar civilization would do everything to stay away from any form of contact to a self-proclaimed "civilization" like ours.

  21. I think once a specie reach an extremely high level of overall intelligence, there are only two possible outcomes: voluntary extinction, or a matrix where individuals can live eternal lives in a virtual heaven. there is no point in colonizing other planets or evolving into machines, because reality is ever changing and thus an everlasting challenge to survive, and there is no real purpose in existing, other than the purpose we decide to make ours.

  22. On point nr 3. Imagine if earth was meant for another civilization as a backup plan for their world, and because of circumstances we arose to steal it from them.. What would they do if the came back to find us. Cool video I really enjoy your stuff!

  23. Good ideas, John Michael. My only quibble? It's not appropriate to throw the cost of a procedure into the equation. A civilization that can build a Dyson Sphere has enough machines working for them to afford anything they want. One does not have to pay a robot.

  24. There is overwhelming consensus that an alien civilization or multiple civilizations have and are visited earth. I find it impossible to believe footage released by military leaders have released in the recent past including the footage released by the Pentagon of a craft moving at incredible speeds and conducting impossible manuvers. I have no doubt. I don't however believe they've made intentional contact with any government to date.

  25. There is one other way to detect alien life. Look for small flashes of light where a war is going on between two different aliens. Just a thought.

  26. I would guess that maybe aliens are not so growth obsessed as we are. It may happen that we eventual find an alien civilization that is not only less advanced but to our horror totally uninterested in our technology or even how far we came to see them.

  27. I love what you say at the end here. Indeed, it sums up the arrogance of many scientists. A smart person in Medieval Europe would have had ideas/imaginings of life in the future, but no real clue as to how we would be living today. Thus, judging other interstellar civilizations; indeed, our own future from the narrow understandings and viewpoints of where we are at this moment in time, brings into question the pretentious, ignorant, wankers, who say things like replicator and teleportation technology will never be possible. Heck, I'm no science major, but I'll go one better, and say one day these technologies might be outdated, or unnecessary.

  28. I can just see all the inner planets making a 90ยฐ left turn towards the sun if it were moved lol. "Gonna be a hot time in the old town tonight". -joker 1989 ๐Ÿ˜‚

  29. Question: Although it's stated that many of these indicators would be noticeable or obvious to our astronomers…… how obvious? Is the average astronomer conducting star studies or crunching data from planet hunting telescopes or the algorithms that are assisting them really accounting for nuances of some these indicators? Do they have a well thought out filter looking for these indicators? Hasn't there been a number of atmospheric gas indicators been proposed over the years, only to be countered by new data or papers proposing natural methods for the presence of those proposed gases? What gas indicator in an atmospheric is the sure-fire indicator of alien civilizations? How many of these indicators will be lost in the data? How long on average will obscure natural explanations persist before artificial explanations are taken seriously? (Turns out it wasn't just one question, and many of these rhetorical)

  30. @10:23 Expensive monetary wise is probably only a human concept. I don't think all advanced civilizations use a money system. They're most likely smart enough to realize that arbitrary things like money are useless and run their civilizations in a way we can't comprehend.

  31. Why do humans always think other alien civilization are way more advanced than us maybe we are the most advanced race saying the universe is still young and theres no rock hard evidence of a super advanced race and maybe alien races are at a similar stage of advancement? Like only sending probes into the cosmos to look for intelligent life and they are only able to research there own solor system.. I dont get why everybody thinks we are like the least advanced civilization. We are proof theres civilizations in the universe but thinking everybody else is way beyond our advancement is silly. Maybe theres a law in the universe that no civilization is able to travel the cosmos due to theres a limit of technology and once every civilization reach that threshold they wipe them selfs out due to biting more off then they can chew so to speak or a natural disaster wipes them out before they get to the full advancement of intelligence. Maybe there is a couple of races who have been able to pass that and are traveling the cosmos who knows.. But saying everyone is far more superior is nuts.. Think about evolution takes millions of years to evolve and first its gonna take million of years for the first micro life to evolve into the next stage then more millions of years to evolve from that into biological life then from that to have a brain then more years to be able to learn the think then to surroundings as tools and so on.. Maybe there is a couple of species who are millions of years ahead of us but theres also gonna be life who are millions of years behind us too.. Loving your videos tho been watching them for about a year and they give alot of informatioand just fun to watch keep up the good work

  32. We dont use radio waves we use entangled particles to communicate. We have a low population by choice so no need for huge energy collectors etc.
    Also we observe you but leave you alone. You are not a nice species and have very low self awareness.

  33. 18:55 Putting aside the wildly different outlooks and philosophies that any alien civilization would have compared to us, I think alien civilizations each comprise of a vastly diverse set of individuals: some ambitious, some nihilistic, some nice, some cruel, some smart, some dumb, some who wish to learn and explore, some who think they have all the answers. And a number who are perverted or outright insane. So in that sense, they would be a lot like us I think.

  34. I might have a method of revealing consciousness, but non-directional out in the universe, with quantum mechanics and the collapse of the wave function. Now with squids used in the past with submarine detection, could be aimed to detect this consciousness out to astronomical distances. it is possible.

  35. Galactic empires are an absurd concept because of the time delay provided by the speed of light. Even if FTL tech is possible, your messages and visual information would still be subject to this limit. "Hey, look what happened on our colony over there 15 000 years ago! Send in the troops!" It just doesn't work practically. So to me, any colonization would involve essentially burning the bridges to the home system, like people paddling across the Pacific in canoes, except on a much larger scale. Any contact, much less centralized control over it would be too sporadic to matter, and not likely to be permanent anyway. Change is the norm, not progress, no matter how much people hate to hear it these days. Of course, this decentralized expansion would still be a good thing if we could do it. It would increase the odds of long term survival for the species, and as far as we know it of complex life, since this is the only place we know it exists. But it would never be an empire because you could never control it. And colonies would change too much over time while inevitably left to their own devices, as would the home system. The colonists would inevitably, eventually develop into different species. They would speak new languages and make new cultures. If they survived. Long enough and they would basically be aliens themselves.

  36. Watching this Iโ€™ve come up with something what if a dying earth like planet sent like a probe with life and thatโ€™s how earth started ๐Ÿค˜

  37. dont buy dyson sphere. once a species is advanced enough to need that kind of energy they'll unlikely need to find it in the environment… we're thinking in terms of our own tech limitations. Even we are nearly ready for fusion tech…. they'll likely completely understand matter and the universe. Which means they'll be able to manipulate matter in the extreme… or exchange it for energy at the drop of a hat…. hey, maybe we are their probe…. maybe we are their machines… its not impossible. The elephant in the room are the highly credible accounts of aliens that have been to earth… including mass sightings and aerial encounters. Seems they can fly at 10000 mph through the atmosphere without creating a blast wave / sonic boom… this suggests they can change interaction between matter…. change gravity influence… etc. They have many of the keys to the universe. We're just starting out! Would a cave man have been able to predict how a man might get to the moon in the 1960's…. or how a 21st century computer / smart phone might work? We're talking about our own species at the same level of evolution (roughly) as us….. now imagine how hard it is to understand tech from another species millions of years more advanced than we are.

  38. Thank you JMG.. I'm on all day marathon, yr video's/voice are just so right๐Ÿ˜‚๐Ÿป๐Ÿ’œ๐Ÿ‡ฑ๐Ÿ‡ทโœ๏ธ
    I like the idea of putting a sunlight absorbing object in orbit around the sun… For study.

  39. Man.. you make videos about things I actually wonder about. I'm a pretty deep thinker, and I'm curious about things most others aren't. I like how you word the title exactly how a person might ask.. it really catches my attention. Thanks!

  40. Interesting video with nice topic . Well for one i think an exo civilization would probably do not want any visitors . Why ? well look at us , we are supposed to started becoming intelligent before 250 k years more or less and within that time frame we reached 7,7 billions of population . Imagine if they are millions of years older as a specie and advanced their population also will be greater if they reproduce in a similar way to us so …tourists might not be welcome . Now to think that they are far more advanced it is also alarming in a way because they would definitely be able to detect us without been detected by us . If we are having wars between us while we all share the same planet , imagine what would happen if they were to visit us or if we did visit them somehow .
    And now the best part . Why would they be much older specie ? If the universe was created as the theory wants it in a BIG BANG that means that time started for everybody at the same time . But in the beginning there were only stars and planets on the making so …it is impossible for them to be THAT old . Anyway my point is for them to be that "highly advanced" means automatically that they are way different as well . We came out of a "chemical soup made in our oceans" according to scientists .
    Perhaps their "soup" was different ? were they faster "cooked" ?
    There are so many things i would love to know but unfortunately i don't and i will probably never will but i know for sure something using a shield was sucking plasma out off the corona of "our" sun … LOL (like we own the star or something) and that piece of video made me think " If someone is that highly advanced getting so close to a star and extract plasma from it it means they know about our sun , our solar system , our planet , about us …"
    Now on our planet there are two sides , those who believe there are aliens out there and they are either expecting them to come or they are afraid of them and there are those who know they are out there and they are either trying to convince the others alien do not exist or they are getting ready secretly for the "arrival" .

  41. I don't believe that they would be making a dyson sphere as they may have found a better way to create energy which may violate rules of energy. who knows, anything is possible.

  42. @14:43 What if we, as in humanity, are self replicating machines? That we are probes sent out to some rocky ball planet in some goldilocks zone?

  43. Its also very frightening that some AlienColonies would build a MegaStructure around OUR
    Own star the sun in space,its perfectly possible if there very big!

  44. Thoroughly enjoyed this video, and others. Having only recently discovered your YouTube channel, I'm catching up with watching your previous videos, and I'm enjoying all of them immensely. Looking forward to more of your creations!

  45. We're looking for reproductions of our own limited tech means and adding large scale to it…and thats why we are looking for Dyson spheres and such. And thats why we cant see anything. Not that there is any better idea I suppose, but it will look as absurd as futuristic depictions from the late 19th C in a few generations.

  46. I feel like until intelligent life walks up and shakes our hand, even if we detected anything like this, it would just be explained away as some freak natural occurrence.

  47. Either there's a cap on how advanced technology can get within what is reasonable for a civilization to do (even if they want to do more), intelligent life is rare, and/or life is rare. Those are my 3 favorite solutions (or some combination thereof) to the Fermi paradox. Also idk why I'm not subscribed…..Fixed!

  48. What If there were aliens out there that are organic in nature but are absolutely massive in size? Like each creature is the size of our moon? Imagine how gigantic they could build their technologies.. yeah.. I guess that's why I don't have my own scientific channel..HA! ๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚

  49. Wait a sec… If you move a star, wouldn't it affect the gravitational pull of all the other planets in that system? Also, if you're moving a star that is going to detonate to save the planets in that system, aren't you also dooming those planets by removing the only light source they have?

  50. Amazing Channel. Keep up the great work. Love all youโ€™re content.

    Both you and Event Horizon are my favorite channels on YT.

    Note: There is a saying. Curiosity killed the cat. If humanity ever go seeking out alien nations it could lead to an earlier annihilation of humanity.

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