According to foreign media CNET reports, Mars has a history of about 4.5 billion years. Thanks to robotic explorers, people have a good understanding of its current climate and atmosphere. < / P > < p > a team led by research scientist Matthew Chojnacki of the Institute of Planetary Science (PSI) looked closely at Valles Marineris’ wind driven dunes, a Martian region known for its extensive canyons. These dunes seem to have been preserved by fossilization, a geological process that turns sediment into rock. < / P > < p > the team published a study on this window of Mars’ past in August in the Journal jgr planets. “Based on the relationship between dune sediments and other geological units and the rate of modern erosion, we estimate that these are about one billion years old,” Chojnacki said in a psi statement on Monday. < / P > < p > a picture taken by the HiRISE camera of NASA’s Mars Reconnaissance Orbiter shows some of the interesting dunes that are now like time capsules. < / P > < p > these dunes are similar to those seen on Mars today, giving scientists clues about what happened a long time ago. “Due to the size and spatial arrangement of dunes, which are not very different from modern equivalents, we believe that climate and atmospheric pressure should be similar to that of modern Mars,” Chojnacki said. < / P > < p > this study has increased understanding of the geological history of Mars and how different the red planet is from earth. Although Mars is now a dry and dusty place, recent research suggests that salt lakes may be hiding under the southern ice sheet. After 12 years, “world class Super project” Shantou Bay Tunnel ushers in a historic breakthrough today