Since the birth of mankind, the earth, an extraordinary planet of life, has become more extraordinary, upgraded from the original planet of life to a civilized planet. For a civilized planet, exploring the vast and mysterious universe is its important task and goal.
Therefore, with the help of science and technology, mankind has embarked on the journey of space exploration. Around 1977, NASA launched a space oriented program, the Voyager program, which launched several interstellar spacecraft into the universe and opened the way to explore the starry sky. Voyager one and Voyager Two are among the best.
Voyager 1 and Voyager 2 were launched about half a month apart. Voyager 2 was the first to launch, followed by Voyager 1. The final result was that Voyager 1 was ahead of Voyager 2 and entered the interstellar space through the crystalline sphere on August 25, 2012. It was also the first spacecraft to enter the interstellar medium in human space history. As of January 2, 2018, Voyager 1 is 21.1 billion kilometers away from the sun.
Voyager-2 has to carry out various missions to explore the solar system, so its journey is slower. After 41 years of flight, voyager-2 finally broke through the heliosphere on December 10, 2018, spanning 18 billion kilometers, becoming the second man-made vehicle to enter interstellar space. This is destined to go down in history, and we are all witnesses of history.
Maybe many people don’t know what the heliosphere is, what interstellar space is, and whether entering interstellar space means going out of the solar system? Let’s give a brief explanation. As we all know, the universe is so vast that it is impossible for stars to exist in all spaces. In fact, although stars are common in the universe, the distance between stars is also very far due to the vastness of the universe.
For example, the nearest star to the sun is about 4 light-years. Because of its huge mass, the gravity and radiation generated by each star will affect the surrounding area. The area that can be affected by the stellar radiation is called the stellar sphere. The stars in the solar system are called the sun, so the farthest point that solar radiation can affect is the heliopause.
In the heliosphere is the place where the hot solar wind fights with the cold and dense space between stars, where high-energy particles from the sun constantly collide with the interstellar medium and emit radiation. The radiation influence range of stars is limited, so the space between stars beyond the radiation influence range is called interstellar space.
Scientists determine whether voyager-2 will enter interstellar space. It is through the PLS detector installed on voyager-2 that the speed of solar wind particles drops sharply that they determine that voyager-2 is about to enter real interstellar space. This kind of interstellar space can be imagined as the earth’s stratosphere, our earth’s atmosphere is also divided into troposphere and stratosphere, troposphere has a variety of climate effects, thunderstorms and other effects. But once it breaks through the troposphere and enters the stratosphere, it will be calm and very stable. For safety, airliners have to enter the stratosphere, so that they will not be affected by the weather and can fly stably and safely.
In the same way, once Voyager enters interstellar space, all kinds of interference and risk factors will be reduced, and Voyager can fly faster and more smoothly. So does breaking through the heliosphere into interstellar space mean going out of the solar system? Of course not. In the past, scientists thought that we would go out of the solar system if we went out of the heliosphere. But later, scientists discovered that the solar system was surrounded by a larger Oort nebula. Only when we went out of the Oort Nebula can we enter the interstellar space outside the solar system.
At present, Voyager 2 is sailing in interstellar space, ahead of the Oort cloud. It will take Voyager 2 about 300 years to reach the inner edge of the Oort cloud, and it may take another 30000 years to fly over the Oort cloud. This shows how vast the Oort nebula is. It is also the most mysterious area in the solar system. No one knows what is inside. At the same time, it also makes people see their own insignificance. If we want to really get out of the solar system, we can’t rely on Voyager. We also need to develop faster aircraft in the future, at least to achieve sub light speed.
Voyager is the first deep space exploration project after mankind stepped out of the earth, and its more important mission is to explore the extraterrestrial civilization. Therefore, Voyager 1 and Voyager 2 both carry a gold CD, which records the earth’s voice, pictures and some words, as well as human information. Most importantly, it also records the earth’s position in the galaxy The exact coordinates in.
Perhaps because at that time, mankind had just stepped out of the earth and knew little about the universe, but was more excited and excited. Therefore, human information and the earth’s coordinates were leaked without much consideration. This kind of thing looks very silly and dangerous now. Hawking has warned mankind several times not to try to connect with alien civilization, because we can not determine whether alien civilization is good or evil.
If we meet the alien civilization with evil, it may be destruction to meet the human. Therefore, no matter what kind of probe we launch, we will not put human information, especially the coordinates of the earth, on the spacecraft. This is also for the safety of the earth. The range of the spacecraft in the solar system is wide enough, and it will take more than 10000 years to fly out of the solar system at the speed of Voyager.
Therefore, human beings still have enough time to retrieve the gold saucer on Voyager. As long as we develop sub light speed flight in the future, we can easily catch up with Voyager and retrieve the gold saucer on them, so as to avoid the risk of leakage of earth coordinates. Before human beings really become the interstellar civilization and become powerful, we still need to develop indecently, or we may bring unknown risks to human civilization.
In fact, the situation in the solar system is very good. Due to the protection of the vast Oort Nebula outside, it effectively avoids the exposure of the earth. As long as the alien civilization is not close to the solar system, it may be difficult to find the existence of the earth. We can also find the existence of some nebulae in the universe through astronomical telescopes, but it is very difficult to find the situation inside the nebulae. It is basically difficult to see what is inside through the nebulae.
The situation of the solar system also tells us that there may be hidden galaxies and hidden wisdom civilization inside those nebulae in the universe. Of course, the existence of the Oort nebula is also an obstacle for human beings to get out of the solar system. Our spacecraft will not be able to fly out of the solar system before it can fly at sub light speed. When human beings have the ability to fly out of the solar system, it has been called a preliminary interstellar civilization, and its strength is not too weak.
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