Astronaut Buzz Aldrin joins Neil Armstrong on the surface of the moon.

Astronauts Buzz Aldrin and Neil Armstrong place an American flag on the surface of the moon.

American astronauts Neil Armstrong and Buzz Aldrin leap across the lunar surface during the Apollo 11 lunar mission.

American astronauts Neil Armstrong and Buzz Aldrin walk on the moon during the Apollo 11 lunar mission.

Montage of a NASA lunar landing.

Film documents Apollo 11's approach to the moon, the landing in the Sea of Tranquility, and the astronauts' walk over the moon's surface.

Montage of the July, 1969 Apollo 11 moon landing.

News Reel footage of Apollo 11's lift-off, the Eagle landing on the lunar surface, the astronauts' historic walk on the moon and collecting rock samples.

Astronaut Neil Armstrong climbs down a ladder and steps onto the moon's surface.

Astronauts Neil Armstrong and Buzz Aldrin place the United States flag on the moon.

Neil Armstrong walks on the moon.

Neil Armstrong walks on the moon.

Neil Armstrong walks on the moon.

Neil Armstrong hops onto the moon.

American astronauts Alan Shepard and Edgar Mitchell of Apollo 14 plant a flag on the moon on February 5, 1971