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Astronaut John W. Young, commander of the Apollo 16 lunar landing mission, stands on the rim of Plum Crater while collecting lunar samples at Station No. 1 during the first Apollo 16 extravehicular activity (EVA) at the Descartes landing site. This scene, looking eastward, was photographed by astronaut Charles M. Duke Jr., lunar module pilot. The small boulder in the center foreground was chip sampled by the crew. Plum Crater is 40 meters in diameter and 10 meters deep (1 meter equals 39.37 inches). The Lunar Roving Vehicle (LRV) is parked on the far rim of the crater. The gnomon, which is used as a photographic reference to establish local vertical sun angle, scale, and lunar color, is deployed in the center of the picture. Young holds a geological hammer in his right hand. While astronauts Young and Duke descended in the Apollo 16 Lunar Module (LM) "Orion" to explore the Descartes highlands landing site on the moon, astronaut Thomas K. Mattingly II, command module pilot, remained with the Command and Service Modules (CSM) "Casper" in lunar orbit.