Mars never had a warm climate and a dense atmosphere - VIDEO PDF Print E-mail
Sunday, 06 September 2015 12:07
Very small deposits of carbonates on the Martian surface indicate that the red planet could hardly lose much of its atmosphere by binding it with minerals of gases on the surface of and conversion to other types of rocks as some planetary scientists, the press service of NASA. "It is possible that the Martian atmosphere has been tenuous at a time when its surface formed the famous river valleys. Maybe Mars was not at the same time warm and the coating liquid water, cold and rich water to leak into the space atmosphere. For channelization much heat was required, and small streams of water would be enough for their production, "- said Christopher Edwards (Christopher Edwards) of the US Geological Survey USGS in Flagstaff. Edwards and his colleagues close to unlocking the secrets of the main Mars - Where did its atmosphere and oceans - studying the geological data collected by the various probes and landers during the last 15-20 years. As the scientists explain, the first observation of the structure of the Martian rocks from space showed that the subsoil of the red planet contain much less carbonate - salt of carbonic acid - the planetary scientists expected to see. The fact is that prior to the arrival to Mars the first orbiter in 90 of the last century, many researchers believed that the atmosphere of Mars and its water does not evaporate into space and become part of its subsoil in the form of carbonate, formed by the interaction of water, alkali compounds and atmospheric CO2. Edwards and his colleagues decided to test how likely such a scenario was, trying to accurately assess the current stocks of carbonates on Mars, and to compare their weight to how many of the compounds of carbon dioxide should have been formed in the past. To do this, the scientists combined data for deposits of carbonate found probe Mars Global Surveyor, MRO and Mars Odyssey. It turned out that on Mars there is only one large deposit of carbonates - so-called "furrow Nili", which contains 34 times less than the connections CO2 than the point estimates, implies the existence of a dense carbon dioxide atmosphere of Mars during those times, when the surface there were oceans and rivers of liquid water. This result means one of two things - on Mars or have any other supplies carbonates are not open for the past 20 years, which is unlikely, or that Mars has never had a warm climate and a thick atmosphere. Scientists themselves are inclined to favor the second option - a "cold and wet Mars," as they put it, which in recent years began to gain popularity among planetary scientists. Such a hypothesis channelization (riverbeds) and canyons on Mars, says that on the surface of the red planet had no permanent oceans. Its waters are almost always frozen, and only occasionally melted as a result of the mass manifestations of volcanic activity or periodic changes in the angle of inclination of the orbit of Mars. The lack of large deposits of carbonates is a serious argument in favor of this, Edwards concludes.