A small rock has been hitching a ride on 's Perseverance rover on the surface of for four months without falling off.The rock attached itself on the Perseverance's wheel in February and has since been transported more than 5.3 miles (8.5 km) aboard the rover, NASA has said. Photos show the Martian fragment tucked into the front left wheel of the Perseverance rover, which landed on the surface of Mars in February last year.
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