Tuesday, Dec. 24 marks the 45th anniversary of the Apollo 8 space mission.
One of the astronauts, Jim Lovell, will honor the celebration by attending an event at Chicago's Museum of Science.
The photo above is of the astronauts from the 1968 mission.
The men from Apollo 8 read from the Bible in the book of Genesis as their spacecraft orbited the moon.
The Apollo 8 mission happened one year before American astronauts walked on the moon.