Ozone Layer found on Venus may lead to Discovery of Life

It turns out that Venus, surprisingly, sports an ozone layer in its atmosphere just like Earth and Mars do, according to a new discovery made by the European Space Agency's Venus Express spacecraft.While observing stars at the edge of Venus, the spacecraft noticed the ozone layer through finding the characteristic traces of gases in the atmosphere absorbing starlight at particular wavelengths. The light-absorbing ozone layer was making the distant stars appear fainter than previously thought."We were surveying the atmosphere of Venus and focusing on other molecules when we stumbled on a very interesting feature in one of the spectra,"  said the lead author Franck Montmessin of the LATMOS atmospheric research center in France.
"The spectral signature of ozone, a distinctive absorption band at [ultraviolet] wavelengths, was rather pronounced and we could clearly discern it in our plots with the naked eye." 
The ozone layer is estimated to float between 90 and 120 km high in the atmosphere of Venus, and is always confined to a rather thin layer, measuring 5 to10 km across.The altitude of the ozone on Venus is three to four times higher and its density 1,000 times less than the Earth's ozone layer.

What is the ozone layer?
The ozone layer is a deep layer in the stratosphere, encircling the Earth, that has large amounts of ozone in it. The layer shields the entire Earth from much of the harmful ultraviolet radiation that comes from the sun. 
Interestingly, it is also this ultraviolet radiation that forms the ozone in the first place. Ozone is a special form of oxygen, made up of three oxygen atoms rather than the usual two oxygen atoms. It usually forms when some type of radiation or electrical discharge separates the two atoms in an oxygen molecule (O2), which can then individually recombine with other oxygen molecules to form ozone (O3).Read more 

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