This mural, created by Robert McCall for the opening of this museum in 1976, represents the past, present, and future of our universe. On the far left is an imaginative depiction of the “big bang” theory of the creation of the universe. In the middle stands an Apollo astronaut on the Moon—a recent event in 1976. To the right are a lunar rover and a second astronaut near a lunar landing module. The command and service module containing the third crew member orbits above the lunar lander. Above planet Earth is the Sun, its rays illuminating the vast region of space open to future exploration.