There are many books about alien life. Some of those books are fictional and some books are more scientific. But the thing is that before we can say whether aliens exist or not, we should determine existence. What do we mean about existence? If alien civilization exists, it might not exist to us.
That is one of the most interesting models of Scrödinger's cat, the thing that exists but doesn't exist. The alien civilization might not just answer to us. It means it can turn its back on us. So, if we compare this situation with parties where nobody talks to us, and everybody walks away or keeps their back turned to us we can say that those persons discuss.
We can see that they exist. But what they say is a mystery. That means those people exist but same way they don't exist. We see how they dress and maybe we see some mobile telephones and other kinds of stuff. But those people don't share anything with us. This is the thing that makes existence interesting.
Or otherwise, if an alien civilization is, let's say, at a distance of 3000 light-years it's the same to us, if that civilization exists or not. For us, it does not exist because we cannot see it, or communicate with it. If that civilization invented the radio 1000 years ago the signal would arrive on Earth in about year 4024. But until that signal arrives on Earth we are alone.
The thing is that we can say that maybe the alien civilization can travel faster than light. But even if an alien civilization can make that thing it must turn its craft to our solar system. And those hypothetical aliens need some reason to come here. So can we someday meet aliens? Maybe that thing will happen far in the future.
Or maybe it will happen tomorrow. Who knows what the thing called alien thinks? Do we know those species? There is no single confirmed attempt where aliens tried to make contact with us. There are some radio signals whose origin is unknown. Those signals happened only once. And that makes them interesting. But because they happened only once it's quite sure that they didn't mean to us.
Cosmic black swans.
That is one thing that we must realize. There is always a possibility that the cosmic Black Swan event creates unique radio signals. The cosmic black swan can be the case that a high-energy reaction like annihilation happens just when a radio impulse travels through that point.
"The black swan theory or theory of black swan events is a metaphor that describes an event that comes as a surprise, has a major effect, and is often inappropriately rationalized after the fact with the benefit of hindsight. The term is based on a Latin expression that presumed that black swans did not exist. The expression was used until around 1697 when Dutch mariners saw them in Australia. After this, the term was reinterpreted to mean an unforeseen and consequential event. " (Wikipedia, Black Swan theory)
That thing means that we are cosmic black swans. We are lucky because we live in a solar system between the galaxy's spiral structures. That means there are fewer particles like in the main spiral structures. So the possibility of collision is smaller than in the main spiral structure. The other thing is that the Milky Way, our galaxy seems to be in a cosmic bubble.
That means energy travels out from our galaxy faster than in other galaxies. That means our galaxy is not as ordinary as we might think. And the location of the sun is not a typical star's location. So we are far from the typical solar system if we think of our location in the universe.
Another thing that we must realize is that our knowledge of the universe is limited. We don't have any experience with things like large-scale high-energy nuclear reactions that form quark-gluon soup. The CERN and Brookhaven produced quark-gluon plasma (QGP) for a very short time. In those tests, only a couple of particles can turn into QGP.
But it's possible. The QGP can have long-term existence in the universe in places like black hole acceleration disks or in their relativistic jets. We don't have very much information about things like quark-gluon plasma and radiowave interactions.
We don't know what happens if a small black hole's relativistic jet hits some planet or asteroid. Of course, we know that the asteroid turns into a molecular cloud. But it's possible. The high-energy jet that comes from stellar or substellar primordial black holes can smash those atoms together and form fusion in that object.
We don't know how those extreme energy levels act on the material. And we don't have experienced what happens if the most high-energy thing in the universe grills objects for hours or even years. We have very little experience in the extreme nuclear reactions. And we don't know a thing about the large-scale extreme nuclear reactions.
When we think about the possibility that the black hole's relativistic jet impacts with some cold planet there is very strong and thick ice that thing can form the antimatter on that planet. That antimatter destroys the planet immediately. And it's possible that things like radio waves travel through that thing in the same moment as an explosion happens.
Of course, we don't know that Black Swans or extremely rare, but possible cases affect things like radio impulses. The antimatter particle may hit some asteroid. At the same moment when a radio wave travels through that. The possibility that this happens is minimal. But it can explain the reason why some radio signals are unique.
https://en.wikipedia.org/wiki/Black_swan_theory
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