July 21 (UPI) -- Pope Leo XIV spoke with astronaut Buzz Aldrin to discuss the 56th anniversary of the Apollo 11 mission. During the call, the two reminisced on the 1969 landing, "reflecting on the mystery of creation, its greatness and fragility."

July 20th is Moon Day, Space Exploration Day and the anniversary of the first Apollo 11 moonwalk. Here’s a look at the Apollo program and the new Artemis program to return to the lunar surface.