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Optimism, a full-scale replica of NASA's Perseverance Mars rover, tests a model of Perseverance's regolith bit in a pile of simulated regolith – broken rock and dust – at the agency's Jet Propulsion Laboratory in Southern California. As with rock cores, Perseverance uses a drill on the end of its robotic arm to collect regolith samples. But to gather the loose material of Martian regolith the rover employs a different drill bit that looks like a spike with small holes on its end. A key objective for Perseverance's mission on Mars is astrobiology, including the search for signs of ancient mic…
