With the help of science and technology, when human beings walk out of the earth and see the vast universe, we can understand that the earth is so small. From the perspective of the universe, whether it is the Milky way, the solar system or the earth, it can only be regarded as a grain of dust.
When we realize the vastness of the universe and the smallness of the earth, a question has to be considered: is the earth the only living planet in the universe? Does alien life exist? Is there an intelligent civilization like human beings in the universe?
Before we go out of the earth, from the perspective of the earth, many people think that human beings are the only one in the universe, and there is no extraterrestrial life in the universe. However, when we really saw the vastness of the universe, most people changed their views and thought that there might be extraterrestrial life, and there might be many intelligent civilizations like human beings in the universe.
Standing on the scale of the universe, it is difficult for us to doubt the possibility of the existence of extraterrestrial life and civilization. Therefore, scientists began to explore extraterrestrial life and civilization from the moment human beings walked out of the earth. In order to search for extraterrestrial life, scientists launched Voyager 1 and Voyager 2 in the last century.
They all carry a CD-ROM, recording the information of the earth’s life and human beings, and more importantly, recording the earth’s position coordinates in the universe. In addition to sending out starships, scientists also search for possible extraterrestrial life in the solar system through detectors, and search for possible extraterrestrial civilization signals in the universe through radio telescopes. In addition, human beings have actively sent wireless signals to the universe many times, expecting to get a response.
Have so many methods achieved significant results? The answer is no, no matter Voyager, solar system probe or radio telescope, we have not found any trace of extraterrestrial life. In addition to the beauty of the galaxy, the whole universe gives us more loneliness. It seems that the whole universe has only one life planet, the earth, and only one intelligent civilization, human beings.
Is it possible that human beings are the only civilization in the universe? Many people may argue that this is absolutely impossible. There are hundreds of billions of stars and trillions of planets in a small galaxy. However, in the current observable universe, there are at least trillions of galaxies as large as the Milky way. Under the huge base, how can there be only one human civilization?
It may be difficult for many people to accept that there is only human civilization in the universe, but some scientists believe that this possibility does not exist at all. In the 1960s, NASA invited British atmospheric scientist James Lovelock to discuss the existence of extraterrestrial life.
At that time, James put forward a “Gaia theory”, which holds that only under the interaction of life and environment can the earth be suitable for the sustainable existence and development of life. What does that mean? To put it simply, Gaia’s theory holds that the earth consciously possesses all kinds of characteristics of life.
Such a theory really overturned many people’s cognition at that time and was not recognized by people. However, with the passage of time, through continuous research and exploration, scientists have found that the earth’s ecosystem is far from as simple as we think. In the 4 billion years since the birth of life on earth, we do not know how many asteroid impact disasters we have experienced.
Through several giant craters left on the earth, we can see that in the history of the earth’s life, there have been many huge asteroid impact events. 65 million years ago, an asteroid about 10 kilometers in diameter hit the earth, causing the extinction of dinosaurs. This asteroid with a diameter of about 10 kilometers is nothing compared with those giant asteroids that once hit the earth.
A long time ago, the earth may have been hit by many asteroids with a diameter of 100 kilometers. However, such a huge asteroid did not completely collapse the earth’s ecology. After the impact, it recovered again after a long time. This powerful ecological restoration ability reminds us of the metabolism of life. Meteorological experts have found that many functions and abilities of the earth’s ecology are very similar to the metabolism of life, so Gaia’s theory may be true.
The earth has such a strong self-healing ability that it can recover from extraterrestrial disasters and natural disasters. However, such a powerful ability is becoming weaker and weaker in front of human beings. We all know that the birth and activities of human beings have caused more and more serious damage to the earth’s ecological environment.
The activities of Homo sapiens in Africa tens of thousands of years ago quickly turned what used to be an oasis into a desert, that is, the largest Sahara desert in the world, covering an area of 9 million square kilometers. This desert is the ecological deterioration caused by the activities of Homo sapiens, the ancestors of modern human beings.
After human beings enter the era of science and technology, the massive development of industry has made great changes in the earth’s ecology in a short hundred years, which is far beyond the self recovery ability of the earth system. If the destruction continues at such a speed, it is possible that after hundreds of years, the earth will no longer be suitable for human survival, and even the earth’s ecology will be completely destroyed and become like the earth There is no possibility of recovery for a desolate planet like Mars.
The continuous development of human beings can make a powerful ecosystem collapse, so will other intelligent civilizations in the universe be the same? We can think like this: when a highly developed civilization develops to a certain extent, it will become more and more self expanding, believing that science and technology decide everything, despise other life on the planet, and even lose respect for nature.
Highly developed civilizations will consider themselves the most special, powerful and important existence on the planet, while everything else is a floating cloud. Under the influence of this expansion, the development of civilization eventually led to the complete deterioration of the ecosystem, so that a living planet lost Gaia consciousness, no metabolic capacity, and finally evolved into a desolate, not suitable for life.
Without a place to live, a civilization will gradually die out and finally disappear into the universe. Perhaps there were many intelligent civilizations in the universe, but when their civilization became more and more developed, they were finally destroyed by nature because of their self expansion.
In fact, human beings are also on the road to destruction. We are also beginning to expand. We think that human beings are the overlord of the earth, and other lives are just ants in front of us. We will destroy them if we don’t like them. As for nature, we gradually lose our awe and begin to destroy all kinds of things instead of governing and restoring them.
If human beings do not reflect on themselves, there will be more and more natural disasters in the future with the continuous deterioration of ecology. When the ecology deteriorates to a certain extent, the Gaia consciousness of the earth will no longer exist. At that time, the earth will lose the ability to repair, and the ecology will collapse completely, and there will be no possibility of recovery.
Can we survive after losing the earth? It may be very difficult. Even if we transform Mars into a home that can barely allow us to survive, no matter how Mars is transformed, its innate advantages will not be as good as the earth, and it will be difficult for human beings to survive for a long time.
Some people may say that the universe is so big that we can go to other galaxies to find a natural home to live in. Although the ideal is very beautiful, but we should not forget, regardless of the distance of interstellar navigation which is so easy to achieve? This requires us to really grasp the mystery of time and space, and we can only do it by jumping in space. To achieve this goal, it will take a very long time, which may be tens of thousands of years, or even hundreds of millions of years.
But will the situation of the earth give us such a long time to develop? Obviously not. That’s why some scientists think that human beings may be the last civilization in the universe. After the disappearance of human beings, the universe will continue to evolve. After countless years, a new civilization will appear. This civilization will also embark on a development path similar to that of human beings. Finally, it may come to an end because of the loss of reverence for nature.