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I’m about to drop my first rock sample collection on the surface of Mars. I’m setting down the scientifically compelling, curated set of rocks at “Three Forks,” a spot just at the base of the river delta I’ve been exploring. #SamplingMars More on plans: http://go.nasa.gov/3DaqCqO https://nitter.net/NASAPersevere/status/1586013999941840896#m

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