The earth is a beautiful planet of life, and human beings are the only intelligent life on this planet. Before human beings go out of the earth, we don’t know the vast universe beyond the earth, and we don’t know how big the earth is.
When mankind entered the road of scientific and technological development, it soon realized the dream of flying to the sky and walked out of the earth. When we stand outside the earth, we know that there is such a vast space outside the earth. When we look back at the earth, we find that the earth is so small. At this time, people will have such a question: in the vast universe, is there really only one life planet earth and only one civilization of human beings?
Scientists naturally don’t believe that there is only one life planet earth and the only civilization of human beings in such a vast universe. They believe that in other parts of the universe, there are life planets like earth and intelligent life and civilization similar to human beings. In order to explore the existence of extraterrestrial life and civilization, in the early days, scientists launched Voyager 1 and Voyager 2, which carried human information and the coordinates of the earth. The spacecraft went deep into the universe, hoping to explore the existence of extraterrestrial civilization.
But more than half a century later, we still have not found any extraterrestrial life. However, with the deepening of human space exploration, more and more people believe in the existence of extraterrestrial life. Because the outside of the solar system is still a place where human beings can not reach and explore, we can only focus on the planets in the solar system where there may be life.
At first, scientists thought that Mars was the most likely planet for the existence of extraterrestrial life in the solar system, so they launched a lot of probes to Mars, from orbital probes to Mars rovers, and launched a comprehensive exploration of Mars. However, at present, we still have no life on Mars. However, scientists found traces of water and methane on Mars, because The possibility of life on Mars is also very high.
In addition to Mars, there is another planet in the solar system. Scientists believe that life is more likely to exist. It may be the most likely planet in the solar system to discover extraterrestrial life. This planet is Enceladus.
Enceladus is the sixth largest moon of Saturn and the brightest moon in the solar system. It is about 1.4 billion kilometers away from the earth. Voyager was the first one to explore Enceladus. In the process of Voyager’s going out of the solar system, it needs to go through Jupiter and Jupiter for gravitational acceleration. Therefore, Voyager made the first preliminary exploration of Europa here.
Through Voyager, we know for the first time that Europa is an ice covered satellite with a diameter of about 500 kilometers. Although it is very small, it has been highly concerned by scientists. In order to further explore Europa, scientists launched the Cassini interstellar probe, which weighs six tons. Its main mission is to explore Saturn and its several important satellites. It reached the orbit of Saturn in October 1997.
With the continuous exploration of Cassini probe to Enceladus, scientists also have a better understanding of this satellite. On April 14, 2017, NASA announced that as the brightest satellite in the solar system, Enceladus has all the necessary conditions for the existence of life. This is also the first time that humans have confirmed the most likely planet for the existence of extraterrestrial life, Why are scientists so sure that there might be life in Enceladus? What did the probe find on Enceladus?
The most direct evidence for NASA’s daring to say that Enceladus is most likely to have extraterrestrial life comes from Cassini’s multiple explorations of Enceladus. Through the probe data sent back by the probe, scientists found a large number of hydrogen molecules in the liquid jet from the geyser near the Antarctic of Enceladus. Researchers believe that the hydrogen source comes from the gap between the ocean and the rock core of Enceladus Hydrothermal reaction, which means that the satellite is likely to have methane and other key conditions for life.
Enceladus is one of the three stars in the outer solar system that have been observed to have geological eruptions so far. It can emit materials through the thick ice layer, which indicates that liquid water is very likely to exist under the ice layer of Enceladus, and it is also a very deep liquid ocean, which may be far deeper than the depth of the earth’s ocean. At the same time, peculiar chemical compositions were also found in the plumes. These peculiar substances include salt and organic matter, so there may be a salty ocean under the ice.
So far, in addition to phosphorus and sulfur, almost all habitable chemicals, such as carbon, hydrogen, oxygen and nitrogen, have been found on Enceladus. Scientists are also optimistic about phosphorus and sulfur, because the rock core of Enceladus is likely to contain phosphorus and sulfur.
All of these materials are the conditions for the birth of life on earth, so it is possible for Enceladus to have life if it meets the conditions. No wonder NASA scientists dare to make such bold remarks. Of course, if life existed on Enceladus, it would probably be in the liquid ocean under the thick ice. At present, human science and technology can’t go deep into the underwater ocean of Enceladus to explore, and naturally, we can’t determine whether there is life.
However, scientists will send a probe to Enceladus in the future. If we can find life in the eruptive material, we can also confirm the existence of life in Enceladus, but this is very small. To be sure that Enceladus has life, we need to go deep into the ice ocean. This can only be achieved when human technology goes further.
It is possible that in the future, Enceladus will be the first planet to discover extraterrestrial life. If there is extraterrestrial life in Enceladus, then some other planets in the solar system may also have life. We need to know that there is not only Enceladus, but also many other planets. Scientists speculate that there is also a huge underground ocean or subglacial ocean, which is possible In the future, we will find that life is not scarce in the universe. On the contrary, it is universal. It is just that intelligent life like human beings may be scarce.
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