Studying winds on Mars is very difficult. On Earth, we can easily use weather balloons or satellite tools to measure wind directly. But on Mars, there are very few places where scientists can put instruments — and the air on Mars is extremely thin. Because of this, getting correct wind data on Mars becomes a big challenge. Rovers and landers on Mars can measure wind speed only where they are located — they cannot check winds across the whole planet. So to understand Mars better, scientists use pictures taken from...