A Martian dust devil can be seen consuming a smaller one in a series of images taken by a navigation camera aboard NASA’s Perseverance rover. Dust devils are formed by rising and rotating columns of warm air. Air near the planet’s surface becomes heated by contact with the warmer ground and rises through the denser, cooler air above. As other air moves along the surface to take the place of the rising warmer air, it begins to rotate. When the...
