The mankind still have not met any life forms outside of our planet. If you ignore the tales of “Area 51” and “eyewitness encounters with UFOs and their pilots” we still have not received any extraterrestrial signals even remotely trying to resemble attempt any intelligent civilization to develop with us interstellar or intergalactic communication. In General, no ewoks and E. T.
Given a surprising level of technology we have achieved over the last 100 years, one could safely assume that any other advanced civilization who had mastered space flight and even appeared in a few hundred years before ours, at the moment, could have even more advanced technology.
Mankind has invented many ways of transmitting messages through space. Some are being used already, time for others yet to come. Once superprodvinutyh aliens want to communicate with us before you will show them a real choice.
Good old radio waves
That is what first comes to mind to people when they talk on the theme of communication with aliens. The reception and transmission of messages using this method has become the subject of interest of many sci-Fi books and movies such as “Contact” and “independence Day.” In the end, we are working with radio waves for nearly a hundred years and achieved a fairly good level of efficiency in their use. Many serious scientists and organizations such as SETI continued to use radio as the primary tool for the search of extraterrestrial civilizations.
With the help of radio waves in the late 70’s was discovered the famous “WOW signal!” — the unexpected and sudden release of radiation from a neighboring star clusters to us, so no one really could not explain. Up to recently. Although, according to the latest information, some astronomers still doubt that the real source of this signal was determined.
Anyway, the radio detection method has several critical flaws. And the first one is that the farther you are from the source of radio waves, so they are weaker. In this case, radio waves sent into space over the last hundred years, will actually dissipate only a few light years, becoming quite elusive.
The solution to this problem is to use a larger transmission radiotrack, but in this case we have to deal with many complex engineering problems. One of them will require the construction of truly gigantic plates, up to the size of the Earth itself. Theoretically, any sverhrazdutaya space civilization was able to solve this problem due to the high level of development of its technology, but somehow I want to believe that she could come to a more efficient and less resource intensive method from the list below.
Where fold and become useless radio waves, lasers can be a more effective way to communicate at deep space distances. Plus in integrity and density. Sent a laser message from a galaxy far, far away on arrival to us will remain clear.
In addition, benefits focus laser communications. As the purpose of message delivery you can even choose a single target, thereby increasing the effectiveness of such messages. In this respect, the lasers significantly benefit from radio waves. A sufficiently advanced civilization could send using a laser transfer messages to other systems, hundreds of light-years. And one of these messages could be caught and here on Earth.
However, there is the question: which frequency to use a laser signal to transmit?
If civilization would be advanced enough, it could use gamma rays. This type of radiation can be transferred to a really giant distance. Of course, this will require huge expenditure of energy, but if we assume that the advanced civilization of lack in these resources will not occur, then the problem should not arise.
For us, the potentially more realistic in the current environment option is to use infrared or microwave lasers. At least simply because they require less energy. And, by the way, this method of messaging we are already slowly starting to adapt.
You may have heard about the “Kepler” telescope — a space Observatory space Agency NASA, which searches for exoplanets by observing the change in stellar brightness that occurs as a result of passage of the planet by the star.
Now let’s imagine that an advanced spacefaring civilization found a way to put into orbit its star artificially created a giant object, rectangular or triangular shape, or maybe even any 1258-gon (object 1258 parties). In this case, we just need to figure out how this object will appear in the telescope that the principle is workable in practice, though, and will have some trouble.
What is even more interesting is the fact that extraterrestrial civilizations do not even need to be sverhrazdutoe to have the opportunity. We even through a couple of hundred years will be capable of such an adventure. All you need is to make the object very thin, to bring into space and assemble in orbit.
The Dyson Sphere
Method will be very similar to the previous one, except for the fact that this will can only do a very technologically advanced civilization. And the main goal is not to be explained by a simple desire contact with us. Rather, the main objective here is to collect the energy that produces the star.
The idea is this: why put into orbit the usual pieces of iron, if you can bring back the billions of solar panels to collect stellar energy? Sounds crazy, I understand. But given our current level of technology, humanity will be able to achieve the level of technology is already a few hundred, and in the less optimistic scenario – for a thousand years.
Having the ability to manually change the starlight, an advanced civilization could send us a reasonably-looking messages. Yes, and it would be much easier to catch and understand these messages, than to sit and decipher the effects caused by located in orbit some object with complex geometric shape, as the point above.
The collected energy of the star could also be used to power other communication equipment and technologies described in this article. Any civilization that can build such structures will be automatically above us on development. And if we somehow first to be able to detect such activity, then sending the response to the message for us is not the best idea.
If you imagine that somewhere there is a civilization superior to that of us by several million years of technological development, then why not imagine that such a civilization will be able to manipulate the movement of space objects at least within its galaxy?
For example, to attract our attention she could control the behavior of neighboring stars or other objects. For example, first to accelerate objects to nearly light speed, and then slow down. Do it again and again. In the end, someone will notice.
Or you can quickly change the properties of the star such as its brightness, and thus to send encrypted messages to, say, Prime numbers or the digits of PI. Of course, these opportunities will definitely require a huge expenditure of energy, and the technology to accomplish this, it is now possible to imagine is that only in science fiction.
However the astronomers of the Earth every night continue to look into the depths of space hoping to find something extraordinary that could definitely attract our attention. The above described features for us, of course, it would seem godlike.
More recently, humankind has confirmed the existence of gravitational waves (rapid changes in the curvature of space-time). In 2015, scientists of the Laser-interferometric gravitational-wave Observatory (LIGO) conducted an experiment and announced the first ever real observation of the ripples of space-time, which was predicted by Einstein.
A highly developed civilization with the help of neutron stars and black holes (the main sources of gravitational waves) could send us as odd, but it is obviously intelligent signals. A little “pohimichit” with the frequency and amplitude of these waves and using them to pass coded information.
All this, of course, will require technological superiority in development. But the good news is that even our current sensors are able to detect gravitational waves, launched from a distance of billions of light years. So any civilization that decides to use them as means of transmitting messages immediately “appear on our radar.”
In fact, these distortions of spacetime are so small, that we are talking about distances smaller than the diameter of any of the proton. But if the aliens really want to attract our attention, they could increase the scale of these waves, so we were able to obtain from them a clearer message. Although the option in which they could use these waves in such a way that they will be able to kill all living things in theory is also possible.
The bombardment of highly charged particles
The earth is subjected to enormous amount of radiation every day. But if the aliens have a way more stronger to change the volume, then, most likely, with this radiation, they can send the signals that we can detect. All you need to do is send increased only a few percent of the total volume of highly charged particles, and our scientists will definitely notice. And the change in the number of particles can be used as the encoding for messages.
Of course, you can think of and more ecological method. But who among the advanced civilizations will take care of some security several billion bipedal apes?
In General, our science this method of communication is still unknown. In addition, it is unknown how generally with this method you can pass a little bit of directed message. In fact, from our point of view, this method seems the most appropriate and effective for interstellar communication. But if aliens are already mastered, why not?
The destruction of something big in space
If the civilization would be quite technologically advanced, it is indeed possible. The destruction of large objects in ways that will definitely attract our attention, and then sending a message using other methods, is clearly not staying away from our eyes and ears. For example, the aliens can run a huge swarm of nanorobots, unstable pelvic fractures large objects and turns them into elementary particles, or use black holes as a sort of intergalactic eraser, erase everything on your way out of reality. Fun, right?
More reasonable, of course, would be to change the rate of decay of any space object like a red dwarf (a star is able to burn trillions of years), it quickly “extinguish”. Our scientists have never seen the death of a red dwarf star. Probably because the universe itself exists less than potentially equal the life cycle of stars. Here we surprised!
In fact, we don’t know whether or physically possible such objects. But if it turns out that wormholes are not only our hypothesis, but quite a real reality, we still don’t know how (natural or artificial), they can be created.
But from this moment begins the most interesting. Maybe the aliens have found a way to put a wormhole near us in the manner of “Interstellar” and use it as a kind of portal for the transmission of physical objects, and radio announcements.
Maybe someday a number of us a wormhole opens, and from it appears a fleet of ships willing to make the first contact. Or willing to harvest…
Changing the laws of physics
When we look into space, I think that the laws of physics apply to the entire Universe, they are constant and never change. It seems to us that everything is as it actually is, but what if we’re wrong?
What if incredibly advanced in terms of technology the aliens have found a way to manipulate physics in such a way that it greatly simplifies the use of those methods that were described above?
When you are subject to the laws of physics – you can control everything. If our tiny, though, and developed monkey brains are not yet able to understand many things happening, even in those parts of the Universe, which reached our eyes, what can we say about the technologies that can not just ignore it, and actually changed the laws of physics?
Just imagine where that technology can destroy large objects, and just pull them over the brink of existence. And instead of just destroying us in the flames, these technologies can deprive us of as such opportunities of existence.