February 18, 2015
A total of 18 astronomers across the globe confirmed the existence of the object. Most agree that it is possibly a cloud and is located so high on the Martian surface that it should have been dissipated by the solar wind, which has not happened.
The proportions, obtained by the study by the University of the Basque Country, place the object almost 200 km above the surface of the red planet and its diameter is estimated to be almost 1,000 km. This has led researchers to consider that the object is a massive cloud of gas, vapor, or even CO2, although no one has detected such clouds that reach only half the elevation that it has reached.
via Origin of mysterious cloud on Mars remains unexplained – FayerWayer.
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