Hundreds of years ago, with the rise of the industrial revolution, mankind began to walk out of the road of scientific and technological development. The power of science and technology is powerful, and it has brought a period of rapid development to human civilization. With the help of science and technology, the dream of flying for thousands of years has been realized quickly.
When human beings walk out of the earth and see the vast universe, they all think of the same question: is there the same intelligent life as human beings in the universe? If we say that before going out of the earth and seeing the vast universe, we may be very proud to say that there is only one civilization in the whole universe.
However, when mankind walked out of the earth, this pride disappeared. People all believed that alien civilization existed. As scientists at the top of human civilization, they had a unique vision. They not only believed that alien civilization existed in the universe, but also believed that the number of alien civilizations was absolutely beyond our imagination, and human beings might be a low-level civilization among countless cosmic civilizations It’s a first-class civilization.
When human beings have the ability of space flight, scientists also hope to explore and discover alien civilization. So in 1977, Voyager 1 and Voyager 2 spacecraft were launched successively. They are outer galaxy space probes developed and manufactured by the United States. The goal is to go deep into the vast universe and fly out of the solar system to explore and find possible alien civilization.
After 42 years of flight, the Voyager spacecraft has now left the Kuiper belt and is heading further into the Oort nebula. Here we’re going to talk about the range of the solar system. At first, scientists thought that Pluto is the outer edge of the solar system. After Pluto, it is out of the solar system and into interstellar space.
But later scientists discovered the Kuiper belt, which is a hollow disk structure around the sun. There are countless kinds of celestial bodies in it, so we can also call it a galaxy level asteroid belt. The Kuiper belt is 30 to 50 astronomical units away from the sun, and its thickness reaches 20 astronomical units. It is a very mysterious region of the solar system, and may also be an important resource mining place for human beings in the future.
Currently, Voyager 1 is 145 Au from the sun, while Voyager 2 is 120 Au from the sun. They are far away from the Kuiper belt, so does going out of the Kuiper belt mean going out of the solar system? Of course not. There’s a bigger structure around the solar system 2000 astronomical units away from the sun. It’s the Oort nebula.
Scientists generally believe that only out of the Oort nebula is out of the solar system into the real extrasolar space. The reason why scientists say this is also analyzed by the origin of the solar system. I believe some friends should know that stars were born in nebulae, and various nebulae were formed in the early universe. The matter in the nebula condenses with each other to form the original star, and the star continues to attract and condense the matter in the nebula through gravity, and constantly expands itself.
When the mass of the star reaches a certain degree, it will activate the internal nuclear fusion, and then evolve into a star, which is the origin of the star. Naturally, the sun came from this way. It was born in the Oort nebula. The matter in the Oort Nebula also formed eight planets, which surrounded the sun and formed the solar system.
In some nebulae, the matter is absorbed and condensed by the stars, leaving nothing behind. Naturally, the nebula disappears. However, the formation of the Oort nebula, the sun and the eight planets did not consume all the material. There are still some material residues far away from the sun. This is the Oort Nebula today. I believe friends all know that the nebula structure is often very large, and the Oort nebula is no exception.
The Oort Nebula covers the entire solar system. It is like a spherical shell surrounding the solar system, in which there are a large number of small objects, long-period comets and so on. Its inner edge is about 2000 astronomical units away from the sun, and its outer edge may be as far away from the sun as 3.2 light years, or 200000 astronomical units, but it may also be only 1 light year, or 63000 astronomical units.
At its current speed of 17 km / s, Voyager one will take at least 520 years to reach the Oort cloud. Voyager 2, with a speed of 15.4 km / s, will enter the Oort cloud in 580 years. Voyager’s entry into the Oort nebula is just the beginning. It will take at least 10000 years for Voyager to pass through the entire Oort nebula. It is estimated that the thickness of the Oort nebula is one light year.
The word “light year” is an unattainable distance for the current technology of human beings. Some people may worry that there are so many small objects in the Oort nebula, will Voyager collide with them and stop in the solar system? Although there are hundreds of millions of celestial bodies in the Oort cloud, the density there is very low. Far less than the density of objects in the Kuiper belt.
When the Voyager spacecraft passes through the Kuiper belt, it does not collide with small objects, so it is less likely to be impacted when it passes through the Oort nebula. Of course, this is not a 100% concept event. There is still an extremely small probability that it will collide with the small objects in it. However, the probability that all the two spaceships will be destroyed is almost zero. Even if one of them is unfortunately destroyed by the small objects, the other can finally get out of the Oort nebula and enter the real extragalactic space, and then move forward to the depth of the galaxy In.
So is Voyager likely to discover or be captured by alien civilizations in the future? In fact, the probability is almost zero. In fact, scientists regretted it soon after the launch of Voyager. The reason is that they carry human information and the coordinates of the earth. If they are captured by alien civilizations, they can easily find the location of the earth based on the above information.
With the continuous improvement of human cognition of the universe, the cognition of alien civilization is also improving. Hawking has repeatedly issued a warning: to remind human beings not to try to contact with alien civilization, it may be a disaster for human civilization that has not yet become an interstellar civilization. As long as it is intelligent life, there must be good and evil, and alien civilization is not necessarily good and peace loving.
Although scientists later regretted it, Voyager has been flying for many years, and the speed of human spaceships now can’t catch up with Voyager at all. Take back the golden discs on them. Later, however, scientists were relieved to know the extent of the Oort nebula. The probability that Voyager will be discovered by alien civilization is almost zero before it goes out of the solar system, unless the spaceship of alien civilization also enters the interior of the Oort nebula.
Of course, Voyager spacecraft will always be a hidden danger for human beings. When human science and technology go further and the speed of the spacecraft achieves a qualitative breakthrough, it is possible to send a spacecraft to recover Voyager. The Voyager needs tens of thousands of years to cross the Oort cloud, which is long enough for human technology to achieve a leap forward development. Perhaps at that time, human civilization had already entered the interstellar civilization. We did not need Voyager to explore the way ahead. We had already walked ahead of them and explored other galaxies.
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