How big is the gravity of Venus?

The whole world is looking forward to unveiling the mysterious veil of Venus' atmosphere. Venus is the closest planet to the earth, but in the past eleven years, most people have ignored the "pressure cooker" of this solar system. VenusExpress, launched by the European Space Agency (ESA), entered Venus orbit today, ready to unveil the mysterious veil of Venus' atmosphere and help mankind to further understand the greenhouse effect of the earth and global warming. Arrive at Venus 9 days early. The unmanned probe "Venus Express" launched by the European Space Agency last year (165438+1October 9) will complete the journey of 400 million kilometers nine days ahead of schedule and arrive at Venus tomorrow. The "Venus Express", which costs more than 2 billion yuan, will start a 1000-day exploration mission in order to fully deconstruct the causes of Venus' abnormal climate and avoid the earth falling into the same climate disaster. Guided by the gravity of Venus, the probe ship will gradually enter the orbit of Venus, and start the engine from time to time to fine-tune the orbit in the next few weeks. It is expected that the Venus Express will enter the elliptical orbit of Venus in early May. During this period, it will measure the temperature and chemical composition of Venus' atmosphere, and analyze the mysterious Venus magnetic field influenced by "solar wind" particles. It takes 13 minutes and 30 seconds for the radio signal from the probe ship to travel to and from the earth. Facing the biggest challenge since launch, Venus Express will face the most difficult challenge since launch. The probe will turn around at 2: 03 pm Beijing time tomorrow, slow down slowly at 4: 00 pm 19, and slow down the speed of 29,000 kilometers per hour 15% within 5 1 minute, and then enter the elliptical orbit around Venus. In addition to cooperating with the rotation speed of Venus, the probe should also be attracted by its gravity, and launch a detection mission over the surface of Venus from 250,000 to 66,000 kilometers. The time of each process should be extremely accurate. "Venus Express" is equipped with seven advanced instruments to study the density, temperature, pressure, magnetic field, gravity field, gas composition and the interaction between solar wind and atmosphere of Venus. It is also equipped with a special camera to understand the volcanic activity and hurricane phenomenon of Venus. The sensing instruments on board track the Venus cloud cluster with visible light, infrared light and ultraviolet light, and the fuel reserve is enough for the probe ship to run in earth time 1000 days. The most successful Venus exploration mission in history was the American spacecraft Magellan. Magellan surveyed 98% of the surface images of Venus with radar, and retired in 1998+ 10. As for other Venus exploration plans, most of them ended in failure. Since then, space researchers have focused their attention on relatively cool Mars and giant planets on the edge of the solar system, which may contain water, but the "Venus Express" exploration plan will make people interested in this scorching planet again. Analysis of the greenhouse effect "Venus Express" is about to unveil the mystery of the earth's sister planet Venus. Venus is very similar to the earth in size, shape and density, so it is called the "sister star" of the earth, which is an excellent reference example of the runaway greenhouse effect and the vicious cycle of heat storage in the weather system. Understanding the physical condition of Venus will help people to know more about the earth's atmospheric environment and alleviate the greenhouse effect. However, the climate of Venus is extremely bad. The surface temperature is as high as 457 degrees Celsius. Not only is there no water on the surface, but 90% of the atmosphere is carbon dioxide, so the whole planet is covered with thick yellow sulfur and sulfuric acid clouds. Scientists estimate that Venus' current climate is caused by the increasingly intense greenhouse effect, so they expect Venus Express to collect Venus' atmospheric structure to analyze its greenhouse effect and long-term hurricanes formed at high altitude, so as to study how to avoid the earth from falling into the same climate dilemma. Many scientists worry that there will be a "positive feedback" phenomenon on the earth, that is, a large amount of carbon dioxide locked in the permafrost of the earth will be released as the temperature rises, which will lead to the melting of ice and snow, thus aggravating the greenhouse effect and global warming.