Mars billions of years ago, the study said a large number of rivers (Figure).

<P> Keywords: Mars, the number of large rivers </ P> <P class=moduleSingleImg01 align=center> Jezero on Mars crater named the Delta, there was a lake. .Ancient Mars, scientists said rivers carrying the clay-like material (green) flows into the lake, thus forming the delta. .</ P> <P> </ P> <P> World Scientific reports [tech.] News: Beijing July 18, according to NASA's Web site reported that NASA's Mars Reconnaissance Orbiter (MRO) .The data from two studies based show on the red planet once had a large number of lakes, rivers and continuously flowing a variety of other wet environments, these areas are likely to support life once. .</ P> <P> One study published in the July 17 "Nature" magazine, research shows that a large number of ancient Mars Hill area (about half the surface area of the red planet) contain clay minerals, these substances .the environment can only be formed under water. .Mars is more in the subsequent periods of drought, these clay-rich area is covered by volcanic rock, but then the meteorite impact, so that thousands of Mars at the clay re-exposed. .The study data is from Mars Reconnaissance Imaging Spectrometer dedicated small (CRISM) on Mars Reconnaissance Orbiter images taken of other instruments obtained. .</ P> <P> Laurel, Maryland, Johns Hopkins University Applied Physics Laboratory Mars Reconnaissance Imaging Spectrometer small dedicated principal investigator Scott Moji said: "These latest results of the reason why people feel .very surprised, because it shows how much water on Mars in general, the duration of how long, and above it the type of wet environment how many. "</ P> <P> such as clay minerals are called .for layered silicates (phyllosilicates), which holds the history of Noah's time on Mars (about 46 million years to 38 million years ago) the interaction of water and rock records. .This period is in the initial stages of the solar system, when Earth, the Moon and Mars being constantly crashing comets and asteroids. .At this time most of the earth plate tectonics, rocks have been destroyed. .Some of them are well preserved on the moon are, but never reveal the existence of traces of liquid water. .Mars rock contains preserved layered silicate in the solar system may be suitable for the early formation of life on the only record of liquid water environment. .</ P> <P> Brown University Mars Reconnaissance Imaging Spectrometer small dedicated group of members and the research published in "Nature" magazine on the thesis of John James Todd, said: "These ancient enclosure in Mars .shows a variety of minerals wet conditions. Most of the rocks are in place under the action of liquid water, a minor change, but the small number of locations, they are very large degree of change, so there must have been a lot of water from .flow through these rocks and soil. This is a really exciting thing, because we will be able to find a lot of this research for future space exploration missions landing sites, these tasks can be in these locations to see if Mars ever .place to live, or whether to find in the ancient red planet for signs of life. "</ P> <P> Another study published in the June 2" Natural - Earth Science "magazine, the study found that Mars .The wet conditions continued for a long time. .After the formation of these thousands of Clay to the millions of years, a system of canals eroded them down from the hills, where the water to form a more moderate delta, river here than to import a Lake Tahoe, California (diameter about .25 miles) of volcanic lake slightly larger. .</ P> <P> Brown University Mars Reconnaissance Imaging Spectrometer small private research group, another member of the bass South Coleman said: "From the ancient lake bed, the distribution of clay, we can see the water will stay here for a few .Millennium. "Elman is known about Mars North Yeze Luo (Jezero Crater) impact basin of an ancient lake within a research paper authors. .He said: "The clay can be a good trap and preserve organic matter, so if there is life in this region have, it is likely the chemical is stored in the delta." </ P> <P> Mars Reconnaissance special small .image analyzer high spatial and spectral resolution than previously launched to Mars on any spectrometer is better, it shows the type of layered silicate minerals and composition differences. .By Mars Reconnaissance Imaging Spectrometer dedicated small data collected by the environment of Mars Reconnaissance Orbiter High Resolution Imaging Spectrometer and scientific equipment, data obtained by combining the research team identified 3 types of water-related minerals, these minerals .Noah can be traced back to the early century. .These three minerals are aluminum - layered silicate, hydrated silica or opal, and more generally, the wider distribution of iron / magnesium - layered silicate. .Differences exist in these minerals that they are in different processes or the formation of different water environments. .</ P> <P> Moji said: "We are working to bring the research group found a list of places to become the next space mission to land in these areas, looking for organic chemicals, or can determine whether there has been on Mars .life. "Pasadena, California, is responsible for NASA's Jet Propulsion Laboratory, NASA's science program in Washington Board (Science Mission Directorate) Management Mars Reconnaissance Orbiter mission. .Applied Physics Laboratory and a various universities, government and private sector researchers from an international research group dedicated small-scale joint operation Mars Reconnaissance Imaging Spectrometer. .</ P> </ p>.