From ancient times to the present, the exploration and research of extraterrestrial life has been uninterrupted. Although people in ancient times did not have the current scientific and technological knowledge, it did not prevent people from thinking about and exploring life on earth. Therefore, many myths and legends appeared in ancient times. These myths and legends are actually the ancient people’s thinking and understanding of other possible intelligent lives besides human beings.
With the continuous development of human civilization, when we enter the era of science and technology, with the help of technology, we can initially explore the space beyond the earth. At this time, our exploration and understanding of extraterrestrial life has entered a new stage. In the eyes of the ancients, there are three planets where life is most likely to exist in the world outside the earth, namely the moon, Venus and Mars.
Especially after humans invented astronomical telescopes, they could see the moon, Venus and Mars more clearly. Through these observations, many people believed that there would be a high probability of civilizations like human beings on these three planets. But when human beings stepped out of the earth and began to explore gradually, we understood that the possibility of life on their three planets was very small.
The moon is the first planet to make a manned landing after humans walked out of the earth. When humans walked on the moon, we also saw a desolate surface of the moon. On the moon without an atmosphere, no life was found. Then, the scientist launches the probe to Venus. When the probe enters the orbit of Venus, what we see is a world of purgatory.
The temperature on the surface of Venus is as high as 460 degrees Celsius, and acid rain is often dropped. In such a harsh planetary environment, it is naturally unlikely that life will exist. So there is Mars, because the environment of Mars is much better than Venus. Therefore, human probes can land on Venus for long-term motion detection.
Through these detections, we have not found any life on Mars. Although we have not found life on Mars until now, various signs indicate that Mars a long time ago may have been a beautiful ecological planet, with a magnetic field, a thick atmosphere, and a vast ocean. We have reason to believe that life might have existed on Mars.
So here is the question: if we discover life on Mars, what does it mean for humans? Is this good news or bad news? Many people may say that if life can be found on Mars, of course it is good news. It can prove that human beings are not alone in the universe. So is this really the case? Here we have to pour a basin of cold water on our friends.
If the existence of life is really discovered on Mars, it will be bad news for mankind. Many people may not understand this. Why is this bad news? We have some simple discussions and analysis on this. I believe many of my friends have seen some science fiction movies about alien civilizations invading the earth.
The powerful alien civilization in the film is difficult for humans to defeat. Although we are the final victory in the film, once such a thing happens in the present world, I believe everyone should understand the ending. For an extraterrestrial civilization that can cross the interstellar to the earth, this little technological strength of the earth is no different from a toy, and mankind has no hope of victory.
Fortunately, we have not discovered any alien civilizations in the universe, and naturally we don’t have to worry about things in sci-fi movies one day being staged in reality. There may be two prerequisites for this kind of thing not to happen. One is that there is only one intelligent civilization in the universe, and the other is that humans are the most powerful technological civilization in the universe.
So is there only one intelligent civilization in the universe? It is difficult for us to give a definite answer to this. Before we discover any extraterrestrial life, we think that human beings are the only intelligent civilization in the universe. But if we find traces of life on Mars, the situation will be completely reversed.
You must know that if any event happens only once, it can be said to be a special case, but if it happens twice, it is not a special case but a regular necessity. Two planets of life appeared on the eight major planets of the solar system, which means that life may be universal in the universe, rather than being very rare as we originally thought, only the earth is the only one.
At the same time, it also tells us that as long as a planet exists in the habitable zone and has suitable ecological conditions, there is a great possibility that life will be born. So how many habitable planets exist in the vast universe? In fact, it is difficult to give a definite value for this number, and it is even difficult to describe the number of habitable planets.
From the perspective of the Milky Way, scientists estimate that the number of habitable planets may reach more than 1 billion. From the perspective of the entire universe, this number will increase countless times, because there are as many as trillions of large galaxies like the Milky Way in the current observable universe of human beings. Among so many habitable planets, even if a small part of it can eventually evolve into intelligent life like human beings, then the number of brilliant intelligent civilizations in the universe is too large to count.
Different wisdom civilizations are born at different times. The universe has a long history of 13.8 billion years. In such a long time, there will be tens of thousands of years, millions of years, or even hundreds of millions of years more advanced than human beings. Powerful, advanced, intelligent and civilized. And if this kind of advanced civilization really exists, then they already have the technological strength to cross the interstellar, and they can easily come to the solar system and to the earth.
According to this line of thinking, the universe should be very lively. There are figures of these advanced civilizations everywhere. Even if they disdain to come to the earth, we can observe the various traces of civilization left by these advanced civilizations in the universe from a distance. . But the reality is that we haven’t found anything, and the entire universe is still dead.
If life is discovered on Mars, it means that there should be a large number of advanced civilizations in the universe, but we have not found any, so contradictions arise, which is the famous Fermi paradox. What should have existed now does not exist, what is going on? It doesn’t make sense, as long as it is normal thinking, I believe everyone thinks this seems impossible?
At this time, someone thought of another conjecture theory put forward by a scientist, that is, the “big filter theory”. This “big filter theory” is suitable for the evolution of life on earth to humans. We all understand that early life on earth was born 4 billion years ago. In the long evolutionary years, at least millions of different kinds have appeared. life.
Theoretically speaking, any life has the possibility of evolving to intelligent life, but in the end only the branch of human beings becomes intelligent life. This shows that in the world of life, there is a “big filter theory”. So is there such a “big filter theory” among civilizations in the vast universe?
The “Big Filter Theory” believes that life on a “livable planet” needs to break through many difficult “hurdles” from its birth to the evolution of a species that can cross the interstellar. As long as it is blocked at a certain level and can no longer move forward, then the final outcome of this intelligent civilization is to go to destruction and disappear into the universe.
Many friends can understand this. Take the earth as an example. The earth cannot always meet the survival needs of mankind. There are too many natural or man-made disasters in nature that can make mankind disappear from the universe. For example, the impact of a huge asteroid can easily end human civilization. Even if we escape all kinds of disasters perfectly, 5 billion years later, the earth will be completely swallowed by the sun.
In fact, scientists have found that the brightness of the sun has been increasing. If this continues, the oceans on the earth will evaporate in about 1 billion years. In other words, humans will have at most 1 billion years on earth. . If before that, human beings cannot cross the interstellar level and become an advanced civilization capable of traversing the interstellar, it will not escape the fate of disappearing in the end.
Obviously, if we find life on Mars, then the “big filter theory” is also confirmed from the side. Life on Mars has not crossed a certain barrier and has not evolved into intelligent life. Even if life still exists on Mars, at most simple microbes have lost the ecological environment that evolved into intelligent life.
The possible existence of the “big filter theory” makes the universe that should be able to prosper and lively become a dead space. This shows that the last interstellar barrier on the road to the development of intelligent civilization is difficult to cross. Perhaps in the 13.8 billion years of the universe, there have been many technological civilizations with the strength of human beings, but in the end they disappeared in the universe because they could not cross the interstellar barrier.
I believe that many of my friends have seen this and understood that the discovery of life on Mars will be bad news. It shows that life in the universe cannot evolve into a species that crosses the interstellar. Otherwise, the current universe would not be like this” Deserted”. Whether mankind can break through the hurdles in the future, and eventually become a powerful civilization that can cross the interstellar, still requires continuous efforts of mankind. I believe that as long as we work hard, and as long as we work hard, perhaps human beings can break this kind of shackles.