While on the moon during Apollo 17, he and his crewmate Harrison Schmitt performed three EVAs for a total of about 22 hours of exploration. Their first EVA alone was over three times the length Neil Armstrong and Buzz Aldrin spent outside the LM on Apollo 11. During this time they covered over 35 km (22 mi) using the Lunar Rover and spent a great deal of time collecting geologic samples that would shed light on the moon's early history. Cernan piloted the Rover on its final sortie, recording a maximum speed of 11.2 mph (18.0 km/h), giving him the (unofficial) lunar land speed record.[1]
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