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Patrick DeGrosse and fellow engineers at NASA's Jet Propulsion Laboratory review data from a recent test of a full-size footpad for a future Mars lander. The 16-inch-diameter (40-centimeter-diameter) 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 (2,27…
