NASA's Perseverance Mars Rover Has a Pebble-Sized Problem Obstructing Rock Sample Collection SCIENCE NASA's Perseverance Mars Rover Has a Pebble-Sized Problem Obstructing Rock Sample Collection

NASA's Mars rover Perseverance is in the process of collecting rock samples to send back to Earth via a future human mission to Mars. But some pebble-sized debris is creating problems for the machine.

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