According to foreign media BGR, images from Mars Reconnaissance Orbiter show that there are some special dunes on Mars, which are like time capsules. The researchers say the dunes are likely to be the same as they were about a billion years ago. Studying these dunes can reveal a lot about the climate history of the planet. The dunes were formed about a billion years ago, according to scientists who study sand dunes. A new paper on dunes has just been published in the Journal of geophysical research: planets. Obviously, dune fossils like this are quite rare, especially at such an extremely detailed level that scientists have the opportunity to study what this part of Mars looked like a billion years ago. < / P > < p > “we found and mapped extensive dune fields in the Marineris Valley Canyon, which show clear evidence of fossilization and burial. For this type of structure, Matthew said in a statement that the extent of erosion in the dunes is rare and sustained. “Based on the relationship between dune deposits and other geological units and the rate of modern erosion, we estimate that these dunes are about one billion years old. Because of the size and spatial arrangement of dunes, which are not very different from modern equivalents, we believe that climate and atmospheric pressure are similar to those of modern Mars. ” The amazing thing about these dunes is that they act as a window through time. Depending on their size, shape and other characteristics, scientists can learn more about the climate and other environmental factors in which they form. < / P > < p > “constantly reshaping the water and structure of the earth’s surface is not a factor at present on Mars, so there is an opportunity to learn from the geological records of the red planet,” Chojnacki explained. “The ancient dune fields found in Valles Marineris, with their complex and diverse geomorphic shapes, preservation degree and background, reveal the richness of regional geology. These results tell us that wind driven sand transport, deposition and fossilization have occurred for most of the modern history of Mars, and that the geomorphic evolution there is quite different from that of the earth Global Tech