Since ancient times, human beings have been full of endless illusions about space. In ancient times, due to the lack of advanced scientific knowledge and space telescopes and other observation equipment, people’s illusions about space can only rely on their eyes looking up at the starry sky at night, cloud research and exploring the distribution of stars in the sky to preliminarily understand the starry sky. Therefore, the ancient people came up with astrology, which is to study the star array in the sky The rules are listed.
Although the ancients did not have advanced observation equipment, we can not underestimate the wisdom of the ancients. They rely on their eyes to track and observe the stars in the sky for many years, and there are still a lot of studies. Now that science and technology are developed, the findings are correct. Even one day, scientists can’t explain the ancient research records. For example, in the ancient records, there is still a planet between the earth and Venus, but now we find that it doesn’t exist at all, or is it some other reason? It’s still a mystery.
When mankind enters the era of scientific and technological development, with advanced telescopes, we no longer have to rely on the naked eye to observe stars. Through telescopes, we can better understand the characteristics of some celestial bodies, such as the moon. Through telescopes, we can see that there are many craters or countless craters on it. It is not as beautiful as the legend On the contrary, it is a very desolate planet.
Of course, the observation ability of astronomical telescope is also limited. Although it can see and discover some distant objects, to know the specific situation of this object, it still needs to explore the spacecraft for close observation. After human walking out of the earth, the first thing we see is our solar system, so the exploration of the solar system is also the main task of scientists’ space exploration.
Of course, depending on the current science and technology of mankind, we will not be able to get out of the solar system for a long time in the future. We can only explore in the solar system. To explore the solar system, it is natural to explore the mystery of the formation of the solar system, the early situation of the solar system and the formation of planets. We now know that the solar system has eight planets, but how these eight planets formed is still a mystery.
The formation of planets is a long process. How this process is is also a mystery. The origin of life on earth is also a big mystery that human beings want to understand. If we want to know the situation of the early solar system and the mystery of the formation of planets, we need to explore and find the objects or materials in the early solar system. Due to the long-term changes of most celestial bodies, the matter on the celestial bodies has already changed, which is no longer the matter of the early solar system.
Only a few asteroids, because they have no atmosphere and are far away from the sun, may still keep the shape and material of the early solar system. There are mainly two areas where such asteroids are distributed, one is the Kuiper belt on the edge of the solar system, and the other is the asteroid belt between Mars and Jupiter. Scientists first focused on the asteroid belt, which is not too far away from the earth, and it doesn’t take too long for the probe to arrive.
Scientists have long observed through astronomical telescopes and found that there are four mysterious asteroids in asteroids. They are Ceres, wisdom, marriage and Vesta. They are known as the “four King Kong” by scientists. Through preliminary observation, scientists have discovered that Ceres and Vesta are our important research targets. These two asteroids not only have rocks And water, but also maintain the early material of the solar system, more importantly, they may be the growth failure of the “dead planet.”.
In order to explore the two mysterious asteroids, scientists launched the Dawn spacecraft on September 27, 2007. Its mission is to explore Ceres and Vesta. Dawn is also the first spacecraft equipped with ion thrusters in human history. In 2012, Dawn spacecraft gave earth the first batch of valuable data about Vesta.
Through these data, scientists found that this asteroid with a diameter of about 500 km actually has a metal core with a diameter of 220 km. This is a very incredible thing, which further proves the past conjecture of scientists that it may really be a failed “dead planet”. In the early days of the solar system, Ceres also formed planetary embryos, forming a huge metal core. At this time, Ceres had the basis for planetary formation.
If there is no accident, Ceres’s gravity formed by its own metal core mass will continue to attract the surrounding materials to gather to it, grow and finally form an earth like planet like Mars. Unfortunately, a larger Jupiter is also forming beside it. Jupiter’s gravity is far more than Ceres, leading to the materials around Ceres to move closer to Jupiter, and the earth like planets around Ceres are formed In the end, we can only die young.
Dawn spacecraft first made a series of explorations on Vesta, and then flew to Ceres. In 2015, the spacecraft carried out a series of explorations on Ceres, the largest planet in the solar system, and sent back many pictures of water ice to the earth humans, reconfirming human’s conjecture. Some scientists even thought Ceres might have a liquid ocean.
Unfortunately, although Liming spacecraft is equipped with advanced ion thrusters, and its fuel consumption is 10 times lower than that of traditional spacecraft, the 11 year space flight has exhausted the last fuel of Liming spacecraft. NASA announced on November 1, 2018 that the 11 year exploration mission of Liming spacecraft has ended. The spacecraft will remain in the asteroid belt forever and become a man-made asteroid in the asteroid belt.
Dawn spacecraft has finished its exploration of two mysterious asteroids. Although its mission is over, it has made great contributions to human beings. Scientists have learned more about these two asteroids through the precious data it sent back. In the future, human beings will send new probes to continue to detect these two asteroids. However, at that time, we may land to collect samples, and bring back samples of rocks above Vesta and Ceres to earth for research. There will be more important discoveries.
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