A black-and-white image taken on the surface of Mars. From the upper left, the Curiosity rover's mechanical arm extends downward, holding a large, complex cluster of scientific instruments (the turret) close to the ground. Directly beneath the turret is a deep, freshly made rover wheel track featuring a distinct zig-zag tread pattern pressed into the fine, dark soil. In the background, the sandy terrain transitions to scattered, flat, light-colored rocks. Sharp shadows indicate bright, direct su图:NASA · NASA Image and Media Guidelines