关于这张图
This setup is being used at NASA's Jet Propulsion Laboratory to test a 16-inch-diameter (40-centimeter-diameter) footpad for a future Mars lander. The footpad was plunged into a test bed filled with 10,000 pounds (4,536 kilograms) of simulated Martian soil in order to see how deep it would sink – too far, and the lander's belly could scrape against the ground during touchdown, damaging it. The Sample Retrieval Lander, which would be central to NASA's Mars Sample Return campaign, is estimated to weigh as much as 5,016 pounds (2,275 kilograms). It would be the heaviest spacecraft ever…
