NASA's Curiosity rover has taken yet another astonishing photograph of the Martian landscape, this time capturing its own small effect on the planet's surface. In a composite image released yesterday, the rover itself is visible in the foreground, with a long line of tire tracks stretching off into the background, the result of a 70-foot drive taken during Curiosity's 21st day on Mars. According to a description provided by the Jet Propulsion Laboratory, which manages the rover, the picture is centered towards the west-northwest. For a more comprehensive view, check out the 360-degree panorama released earlier this week.