好奇号探测车在火星上发现粘土块
2019 October 29 Curiosity Rover Finds a Clay Cache on Mars Image Credit: NASA, JPL-Caltech, MSSS Explanation: Why is there clay on Mars? On Earth, clay can form at the bottom of a peaceful lake when specific minerals trap water. At the pictured site on Mars, the robotic rover Curiosity drilled into two rocks and found the highest concentration of clay yet. T...