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NASA's Perseverance Mars Rover gets balanced

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    Just as an auto mechanic places small weights on a car tire's rim to bring it into balance, the Perseverance team analyzed the data and then added 13.8 pounds (6.27 kilograms) to the rover's chassis. Now the rover's center of gravity is within 0.001 inch (0.025 millimeters) of the exact spot mission designers intended.