Solar wind experiment on the Moon, 1969-1972.
© National Aeronautics & Space Administration / Science & Society
In this experiment an aluminium foil sheet was placed on the Moon at the beginning of the mision and then was brought back to Earth for analysis of the surface for impact by solar wind particles. This experiment was carried out on the Apollo 11, 12, 14, 15 and 16 misions. The shadow of one of the astronauts appears in the bottom left corner of the picture.