Earth is a planet in the solar system. There are eight planets in the solar system, namely Mercury, Venus, Earth, Mars , Jupiter , Saturn , Uranus and Neptune . There is also an Pluto outside Neptune. Pluto was once a planet, but later scientists believed that Pluto's size and mass were too small, so they kicked Pluto out of the ranks of planets. Currently, there is only eight planets in the solar system. Among the eight planets, only the planet on Earth gave birth to life. The emergence of life added a lot of color to the planet on Earth, especially after the appearance of humans, it unraveled many mysteries on Earth.
Modern science believes that humans evolved from ape creatures. More than 2 million years ago, ape creatures lived on the earth. At that time, there were still many ferocious creatures living on the earth. In order to develop for a long time, ape creatures could only choose to live together. Group life can not only effectively resist foreign invaders, but also promote communication between each other. Frequent communication can make the brain develop faster. Because ape creatures communicate frequently together for a long time, the brains of ape creatures have become more and more developed, and eventually successfully evolved into humans. After the birth of humans, they began to constantly explore the mysteries of the world. After thousands of years of technological development, humans have also learned more and more about the world.
After humans walked out of the earth, what they wanted to know most was whether there are aliens outside the earth? With this question, humans embarked on the road to exploring the universe. 45 years ago, scientists launched the Voyager 1 detector outside the solar system. The purpose of launching this detector is to let it fly out of the solar system and explore the mysteries outside the solar system. However, so many years have passed, the Voyager 1 detector has not completely flew out of the solar system. After calculation, scientists have calculated that according to the current flight speed of the Voyager 1 detector, it will take at least tens of thousands of years to completely fly out of the solar system. For humans, tens of thousands of years is too long.
At present, humans are basically observing the exploration of alien life by astronomical telescope . The diameter of the universe that humans can observe is about 93 billion light years, and this range is not the entire range of the universe. The universe may be larger than we imagined. How big is the universe? Currently, scientists are also actively researching. Scientists believe that the reason why the Earth can give birth to life is mainly because the Earth meets the three basic conditions for the birth of life. These three basic conditions are appropriate temperature, sufficient air, and abundant water resources. If other planets can meet these three basic conditions, then the possibility of other planets giving birth to life is also very high.
Currently, many scientists believe that there must be alien life in the universe. Why do you say that? Because there are so many planets in the universe. Take our Milky Way as an example. In the Milky Way, there are about 100 billion stars and more than 40 billion planets. Among so many stars and planets, is it only the planet Earth that gave birth to life? This is obviously impossible, so scientists generally believe that alien life exists. Seeing this, I believe many friends will definitely have a question, that is, why haven’t we found alien life yet? Many people think that our imagination of alien life may be wrong from the beginning.
Because scientists have always been searching for alien life according to the conditions of the birth of Earth's life, but this greatly reduces the limitations. Scientists believe that the probability of carbon-based life in the universe is higher. After scientists' research, it is concluded that life on Earth is basically carbon-based life, not silicon-based life . Silicon and carbon belong to the same family. In our human body, 97% are composed of six elements, namely carbon, hydrogen, nitrogen, oxygen, phosphorus, sulfur, and a small number of other elements, such as calcium, iron, zinc, etc., and carbon-based life has stability.
The highest proportion of the earth's organisms is oxygen. However, oxygen element cannot exist in the form of a single substance, but in the form of hydrogen and oxygen. Water has a role in stabilizing cell structure and function much lower than that of carbon. Therefore, scientists call life on Earth carbon based life, and carbon atom is the most stable element. I believe many friends should know that in chemistry, the structure that makes up molecules is atom , and a special chemical bond is needed to influence each other. This chemical bond is a hook. Under normal circumstances, the atoms with the largest number of hooks have the strongest stability. Because it can hook other atoms. For example, the hydrogen atom of , , has a chemical bond, so it can only hook one atom, and the hydrogen atom has two chemical bonds, so it can hook two atoms, but the carbon atom has four chemical bonds, so it can hook four atoms at the same time. From this point, we can see that carbon atoms are the most stable atoms. Scientists have found through research that carbon atoms can produce carbon-based life, and our life on Earth is all carbon-based life.
However, many people believe that life should be diversity . Although life on Earth is carbon-based, it is not necessarily carbon-based life in the universe. Perhaps aliens do not need oxygen and water resources can survive. The fundamental reason why we have not found alien life is that our technology is not developed enough. Now we cannot even fly out of the solar system, let alone explore planets outside the solar system. Now scientists have discovered Earth-like planets outside the solar system, such as Kepler 452B. This planet is about the same size, light, mass, and revolution days as the earth, so many scientists believe that life may exist on this planet.
However, due to the limited technology of human beings, we cannot fly to this planet to explore now, so scientists can only guess that many people believe that alien life should be universally present in the central area of the Milky Way, because there are rich resources in the central area of the Milky Way. We all know that the development of any organism is inseparable from resources. Although we also have many resources on earth, these resources on earth are the most ordinary resources. If human technology reaches a secondary civilization in the future, then these resources on earth will not be able to meet the needs of human beings. At that time, we will need more powerful energy, such as stellar energy and black hole energy.
Scientists believe that when the level of alien civilization reaches the second level, then alien civilization can create Dyson Ball . Dyson Ball can wrap the entire star and then continuously absorb the heat of the star. When observing stars in the universe, scientists found that many stars suddenly drop in brightness, which may be related to the Dyson Ball of alien civilization. However, these are all scientists' conjectures. The editor believes that in addition to life on Earth, there must be alien life in the universe, but humans have not found them yet. With the advancement of human science and technology in the future, we will definitely be able to find alien life. Do you have anything to say about this?
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