NASA's Perseverance rover continues collecting Martian rocks. The car-sized robot just snagged its fourth Red Planet rock sample, drilling another core from an intriguing stone that it first sampled a little over a week ago. "A rock so nice, I sampled it twice! Just capped and sealed my fifth sample tube, with another piece from this interesting rock. I'm doubling up on samples at some high-priority targets like this one...
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