In the month of September, NASA should the press and the whole world to proclaim the most exceptional discovery ever made on Mars: the discovery of liquid water saturated with salts.
This finding is not called into question by the announcement of the group of French scientists, it relates to that of the relationship between past Martian Water and locating gullies.
For a long time it was customary to assume that the observed gullies on Mars were carved out by water when the planet offered a warm, moist environment. However, it appears that the formation of these structures is newer than that previously thought, and that besides this, they would have been created by dry ice.
Thus, some of the elements that led us to think that Mars was full of liquid water in the past shatters. Gullies located between 30 ° and 60 ° latitude observed in the 2000s actually originate from the condensation of the atmosphere at the end of the winter, which form of dry ice.
The solar rays heat the ground surface, causing sublimation, a direct transition from the solid to the gas phase. The surface of ice fracture, and we witness violent decompressions capable of causing landslides and flows. The phenomenon observed from satellites while like a liquid stream, in reality it is not.
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