Answer: Falling Astronaut  In 1971, the crew of Apollo 15 placed a small sculpture on the lunar surface next to a metal plaque suspended next to it. This small sculpture ̵
Before the Apollo 15 mission, astronaut David Scott met Belgian artist Paul Van Hoeydonck at a dinner party. Scott commissioned Van Hoeydonck to create a small statuette to commemorate the astronauts and cosmonauts who lost their lives in human space exploration research. The result of the commission was Falling Astronaut a small aluminum figure of simple design, which, according to Scott's instructions, is not identifiable as male, female or a particular ethnic group, but simply as human.
After Scott and his fellow astronauts received permission from upper NASA management before the mission, they smuggled the statuette aboard the Apollo 15 launch and placed and photographed the monument hidden on the moon's surface. It was only when they returned to Earth that they publicly announced it at a press conference after the mission.
After the revelation, the National Aerospace Museum requested that a replica be made for the public exhibition, which was handed over to the Smithsonian Institution the following year. It can now be seen with a replica of the memorial plaque in the National Mall building of the Space Race Wing Gallery 114.