There are eight planets in the solar system. The planets in the habitable zone are Venus, earth and Mars. Mars is the most explored planet after human beings go out of the earth. However, Venus is called the Sister star of the earth by scientists, which is more similar to the earth than Mars. Moreover, Venus is closer to the earth. It takes at least 286 days to go to Mars from the earth, but it only takes about 100 days to go to Venus.
As a result, there is a question that many people do not understand: since Venus is closer to the earth and more similar to the earth, why not spend a lot of energy to land on Venus and explore, but choose a farther Mars? For this problem, let’s listen to the explanation of scientists.
Venus is one of the eight major planets in the solar system. It is the second closest planet to the sun and also the closest planet to the earth. The ancients called it Changgeng, Qiming, Taibai or Taibai Venus, which was called Aphrodite in ancient Greek mythology. The revolution period is 224.71 Earth days. Venus will reach its maximum brightness just before sunrise or later after sunset. It appears in the eastern sky in the early morning, known as “Qiming”; in the evening, it is on the west side of the sky, known as “Changgeng”.
Venus is an earth like planet, because its mass is similar to that of the earth, and it is sometimes called the “Sister star” of the earth. The radius of Venus is about 6073 km, only 300 km smaller than that of the earth. Its volume is 0.88 times of that of the earth, and its mass is 4 / 5 of that of the earth. Its average density is slightly less than that of the earth. From these comparisons, Venus is really very similar to earth.
Although Venus and the earth have too many similarities, their environments are very different. Venus is a planet without magnetic field, which makes scientists feel very strange. We should know that all earth like planets basically have magnetic field, but the strength is different. However, Venus is a planet without magnetic field at all.
According to the truth, it is very difficult for a planet with very weak magnetic field or without magnetic field to have a thick atmosphere. However, Venus has a very thick atmosphere. With a thick atmosphere, it will naturally form a certain ecosystem. However, the composition of Venus’ atmosphere is totally different from that of the earth. The main components are carbon dioxide and sulfur dioxide.
Carbon dioxide is a greenhouse gas. The reason why the temperature of the earth is getting higher year by year is that the concentration of carbon dioxide is increasing. The carbon dioxide content in Venus’ atmosphere has reached 98%. Therefore, the temperature of Venus’ surface is very high, with an average of more than 400 degrees Celsius. In time, it will reach about 500 degrees Celsius.
With such a high temperature, it’s very difficult for human probes to land on the surface of Venus and explore for a long time. In fact, when human beings just came out of the earth and began to explore the universe, they first explored Venus rather than Mars. Dozens of probes were launched to Venus, and several of them also landed on Venus.
However, due to the thick atmosphere protection of Venus, it is very difficult for orbital probes to see the details of the surface of Venus. Although the landing probe broke through the atmosphere and landed on Venus, its survival time was too short. The longest probe lost contact within two hours.
In addition to the extremely high temperature on the surface of Venus, the acid rain layer in the atmosphere also has acid rain from time to time. In this extremely harsh environment, human detectors can not survive on the surface of Venus at all, and they know very little about the detection of the surface of Venus by orbital detectors. So, later, scientists basically gave up the exploration of Venus and focused on Mars.
Mars has only a very thin atmosphere, and the orbiter can see some conditions on the surface of Mars clearly. More importantly, the rover can carry out long-term mobile exploration on the surface of Mars, so that more detailed Mars data can be obtained. So scientists are not interested in Venus? Of course not.
In fact, scientists pay no less attention to Venus than Mars. In recent years, scientists have been studying the data detected by the Venus probe in the past. From this data, scientists have made new discoveries. The data shows that there are some moving objects on Venus. Scientists guess whether these moving objects are Venus life?
Although in our cognition, life is unlikely to exist in such an extremely harsh environment as Venus, with the discovery of life in the earth’s extreme environment in recent years, scientists have a new understanding of the adaptability of life to the environment. It is possible that in the extremely harsh environment we think, there can be no life, but there may be special life.
Venus is more mysterious than Mars to some extent. Mars can be explored by various probes. Because Venus has a very thick atmosphere, its surface temperature is particularly high, and it often rains acid rain, the Venus probe can only make some vague explorations in orbit, and it is difficult to understand the real and specific situation of the surface of Venus.
For Venus, it’s not that scientists don’t want to land for exploration, but that human science and technology can’t do it now. Only when human beings have more advanced space technology and stronger high temperature resistant materials, can they really land on Mars for long-term exploration. At that time, we can have more knowledge about Mars. Maybe it will make significant discoveries than Mars. We hope that Waiting for the day to come.
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