The Soviet interplanetary station “VEGA-2” have studied Venus in 1985.
Scientists from France and the United States explained the results of observations made by the Soviet station “VEGA-2” in the atmosphere of Venus. A study published in the journal Nature Geoscience.
Sudden changes in temperature discovered by Soviet station at the height less than seven kilometers from the surface of Venus, the specialists explained changes in the chemical composition of the layers of the gas envelope of the planet. The reasons why the atmosphere of Venus, there are similar conditions, were not previously known.
In the gas shell of a celestial body is dominated by carbon dioxide and nitrogen, the concentration of the latter, as suggested by the authors of the study, begins to fall sharply, since the height of about seven kilometers. Since 12 kilometers, according to scientists at the temperatures of 700 K and a pressure of 75 bar the substance in the atmosphere of Venus behaves as a supercritical fluid.
Experts do not know why the nitrogen content begins to decline sharply near the surface of the planet. One explanation the authors consider the observed convection. If this hypothesis is correct, then the nitrogen content in the gas shell of a celestial body is 15 percent lower than previously thought. To such conclusions the authors arrived at in the course of theoretical calculations and experimental simulations of the atmosphere of Venus.
The Soviet interplanetary station “VEGA-2” have studied Venus in 1985, the mission, consisting of the span of the machine and descent of the probe, found to be successful.
Dimensions, weight and the acceleration due to gravity on the surface of the second farthest planet from the Sun system is comparable with the characteristics of the Earth. The temperature of the atmosphere of a modern Venus reaches 750 degrees Kelvin, its envelope of gas is 90 times denser than earth’s. A complete revolution around the Sun makes in the planet 224.7 earth days.
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