'Goodwill' lunar rock sample. Lunar sample 70017 was the last rock obtained during the Apollo 17 mission lunar surface operations (11-14 December 1972). Fragments were later distributed worldwide, called 'Goodwill' rocks. It is a vesicular basalt weighing almost 3kg and over 3 billion years old. The symbol at bottom right indicates that this is the 'west' side of the rock. The Apollo moon landings returned 2,415 samples and over 380 kilograms of moon rock. Moon rocks aid studies of conditions in the early solar system when the Moon and Earth were forming. Photographed in 1972, in the Lunar Receiving Laboratory, Houston, Texas, USA.