A partial view of the Apollo 16 Apollo Lunar Surface Experiments Package (ALSEP) in deployed configuration on the lunar surface as photographed during the mission's first extravehicular activity (EVA-1), on April 21, 1972. The Passive Seismic Experiment (PSE) is in the foreground center; Central Station (C/S) in in center background, with the Radioisotope Thermo-electric Generator (RTG) to the left. One of the anchor flags for the Active Seismic Experiment (ASE) is at right.
