Solar panel for a Pioneer lunar orbiter probe, the type that was launched into space by the Atlas-Able expendable launch system in 1959 and 1960. The panel approximately measures 27" x 21", and contains 20 rows of solar cells to either side. The panel is covered by protective plastic, portions of which have since broken, that can be fully removed if so desired; the panel itself is in fine condition and presented in a large metal carrying case that weighs roughly 27 pounds.
