A piece of Mars: We are looking way up high on Arsia Mons, one of the tallest mountains in the Solar System (its summit is ~19 km high — Mt. Everest tops out at 8.848 km; the location of this image is at ~10 km). Up here the winds come screaming down the mountain at night, and over time nothing can withstand it. Here a volcanic crater has been slowly blurred by such wind scour. (HiRISE ESP_011677_1655)
Can you tell which direction the wind blows?