When did you last have a look at the images of the Martian surface? It the images are three years old, then take a glance once again, and see if you can recognize them. You are to find the surface with new gullies and fresh boulder tracks. Yes, the Martian surface has undergone dramatic changes in less than three years. The new images taken on April 2005 reveal a sand-dune slope, no trace of which was found in the earlier images. Orbiting since the last nine years, Mars Global Surveyor spacecraft suggests that the Red Planet is perhaps more active than previously thought. . Scientists assume the gullies might have formed when frozen carbon dioxide trapped by windblown sand vaporized, releasing gas that allowed the sand to flow freely. They also contemplate that tracks were probably caused as dozens of boulders rolled down a slope as a result of strong wind or a quake.
Mars More Active Than Contemplated
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