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Engineers react with surprise while testing how NASA's Perseverance rover will deposit its sample tubes on the Martian surface. Less than 5% of the time, a flat end on the sample tube caused it to land straight up after dropping. This test was conducted using OPTIMISM, a full-scale replica of Perseverance, in the Mars Yard at NASA's Jet Propulsion Laboratory in Southern California. Perseverance has been taking duplicate samples from each rock target the mission selects. After depositing one sample on the surface Dec. 21, 2022, the rover has 17 samples in its belly, including one atmospheric s…
