Why leave objects behind? In some cases, the item has a special meaning. In 1969, when astronaut Neil Armstrong became the first human ever to walk on the moon, he left a gold olive branch as a symbol of peace for all people on Earth.
Other times, objects are left for personal reasons—or simply for fun. In 1972, astronaut Charles Duke left a family photo on the moon. Alan Shepard snuck a golf club onto the 1971 Apollo 14 mission. He found time to play a little on the surface of the moon, and the two balls he hit are still there!
Most commonly, though, astronauts leave items on the moon for practical reasons. During the Apollo missions, astronauts needed to bring moon rocks back to Earth to be studied. To allow for the weight of the heavy moon rocks, the astronauts left behind as much as possible—tools, video cameras, and other equipment.