French researchers think it is likely: guttering on Mars are caused not by water but by evaporating dry ice. This is the current theory of NASA on the head.
Scientists from the French Research Centre CNRS currently provide sensation. In their opinion it is indeed unlikely that drains crater slopes of Mars are actually from running water. Why? Because they are less than a million years old. And at that time the Martian climate was allegedly too cold to allow the required amounts of water.
Alternative scenario: Evaporating dry ice causes crater gullies
In the journal Nature Geo-science, scientists have presented an alternative scenario. Therefore, Mars goes through similar seasons like the Earth. When it gets colder, frozen carbon dioxide from the atmosphere and sets as dry ice on the ground – partly in the form of thick and transparent plates.
Under these plates can be a significant prints build, which destabilized the ground and brings to the flow. If the temperatures are rising, evaporating dry ice – without it going through a liquid phase – and exposing the gutters. They may evolve according to researchers so completely without water. Allegedly, simulations support this assumption.
Previous acceptance of NASA: flowing brine makes crater gullies
The US space agency NASA has another explanation for the origin of the crater gullies: researchers with the help of the spectrometer of probe Mars Reconnaissance Orbiter (MRO) the signature of the crystals with a closed water in the erosion gullies have, who visibly had to extend between 2006 and 2009. These so-called salt hydrate absorb humidity in the Martian summer, and forming a brine that flows down the crater walls, then evaporates and leaves wet salts.