关于这张图
NASA's Ingenuity Mars Helicopter captured this view of sand ripples during its 70th flight, on Dec. 22, 2023. Taken from about 39 feet (12 meters) above the surface, the image shows the widest swath of sandy, relatively featureless terrain the helicopter had ever flown over. Ingenuity navigates by tracking the relative motion of surface features it sees beneath it, using its black-and-white navigation camera. An algorithm used by the navigation system incorporates the relative motion of features such as rocks, boulders, and ridges into the helicopter's calculation of position, velocity, and a…
