A piece of Mars: Wind streaks are a common sight on Mars. They are formed either by the wind blowing stuff away or blowing stuff in, and it can be quite difficult to tell which is which. In this case, I’m not entirely sure — I suspect the bright orange streaks are erosional and the darker ones are depositional. The pale pink ones are a mystery to me. Regardless of how they form, they certainly indicate winds have blown from the lower right to upper left. (HiRISE ESP_027007_1690)