Existence of Volcanoes on planet Venus , proof by a Researcher.


Researchers proof about the existence of Volcanoes on planet Venus:

Despite decades of research, no proof about the Existence of volcanoes on planet Venus was available until now. Now a recent research by geophysicist Robert Herrick of the University of Alaska, Fairbanks, which he disclosed at the Lunar & Planetary Science Conference in Houston and published in the journal Science, has finally caught one of planet's volcano in the act. 

As we already know that the planet Venus is of same size, mass and density as the planet Earth. So the rate of heat generation in its interior ( Decay of radio active elements) is same as Earth. on the planet Earth, the main way of the heat to come out is through volcanic eruptions. It has been noticed that during an average year, at least fifty volcanoes erupt. 

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Because of the dense atmosphere including an unbroken cloud layer which acts as an opaque to most wavelengths of radiation, including visible light at a height of about 45-65 km , it is not so easy to study Venus surface. so the only way is a radar which is directed downward from an orbiting spacecraft.

There is a technique know as aperture synthesis. This technique helps in the constructing an image of the surface. This incorporates different intensities of radar echoes bouncing off the ground, including delays between transmission and reception, as well as the slight frequency shift corresponding to spacecraft approaching or moving away from the origin of a particular echo. The resulting image looks more like a black and white photograph, except that lighter areas usually correspond to rougher surfaces and darker areas correspond to smoother surfaces. 

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we must have knowledge about NASA's Magellan spacecraft which orbited Venus from August 1990 to October 1994, using this type of radar technology to map the surface of Venus with a spatial resolution of no more than about 100 meters. Lava flows were found to cover more than 80% of her surface, but when it most recently erupted and whether it is still erupting remains a mystery for the next 30 years. 

There were various indications that the spacecraft operated through clouds, sometimes through them. This suggests that the rock is so young that its minerals have not yet changed due to reactions with the acidic atmosphere and is therefore freshly erupted lava. Thermal anomalies that may correspond to active lava flows were also discovered, as were temporal local variations in atmospheric sulfur dioxide concentrations. This is another possible sign of a volcanic eruption. But none were entirely convincing.  

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