German scientist Dr. Wernher von Braun explains the Saturn Launch System to President John F. Kennedy during a visit. NASA Deputy Administrator Robert Seamans is to the left of von Braun. (NASA) #

Astronaut Neil Armstrong on a one-day Gemini VIII mission in March of 1966. Gemini was a stepping-stone project, working toward the upcoming Apollo missions. (NASA/Space Frontiers/Getty Images) #

Astronaut Neil Armstrong, Apollo 11 mission commander, floats safely to the ground after an accident during a training session on May 6th, 1968. The Lunar Landing Research Vehicle (LLRV) exploded only seconds before while Armstrong was rehearsing a lunar landing at Ellington Air Force Base near the Manned Spacecraft Center (MSC). This photo is an enlargement of a frame from a 16mm documentary motion picture recorded during the mishap. (NASA) #

Neil Armstrong (left) watches Buzz Aldrin take a documentary photo of a sample during a training session on February 24th, 1969. (NASA) #

Michael Collins works in a Command Module simulator (with an assistant beside him). (NASA) #

Neil Armstrong poses for a photograph at the Lunar Landing Research Facility at NASA Langley in Virginia on February 12, 1969. (NASA) #

An official NASA portrait of astronaut Buzz Aldrin. (NASA) #

An aerial view of the 363 foot-tall (111 m) Apollo 11 Saturn V rocket rollout from the Kennedy Space Center's Vehicle Assembly Building in Florida on May 20th, 1969. (NASA) #

The Apollo 11 crew and Donald K. "Deke" Slayton look over charts during the traditional launch day breakfast of steak and eggs on July 16, 1969. (NASA) #

A technician works atop the white room, through which the astronauts will enter the spacecraft, while other technicians look on from the launch tower at the Kennedy Space Center in Florida on July 11, 1969. (NASA) #

Every console was manned in firing room 1 of the Kennedy Space Flight Center (KSC) control center during the launch countdown for Apollo 11. (NASA). #

Lift-off of the Saturn V rocket, carrying astronauts Neil Armstrong, Michael Collins, and Edwin "Buzz" Aldrin Jr, along with 6,700,000 pounds (3,039,000 kg) of fuel and equipment into the Florida sky, bound for the Moon, on July 16th, 1969. (NASA) #

A 70mm Airborne Lightweight Optical Tracking System (ALOTS) camera, mounted in a pod on a cargo door of a U.S. Air Force EC-135N aircraft photographed this event in the early moments of the Apollo 11 launch. The mated Saturn V second and third stages pull away from the expended first stage. Separation occurred at an altitude of about 38 miles, some 55 miles downrange from Cape Kennedy. (NASA) #

A view of Earth from orbit shortly after launch, July, 1969. (NASA) #

Lunar module pilot Edwin "Buzz" Aldrin, inside the module as it makes its way toward the Moon, July, 1969. (NASA) #

Looking back over their shoulder, an Apollo astronaut takes a photograph of the Earth during the long translunar coast. The body and some thruster nozzles of the Lunar Module are visible in the foreground. (NASA) #

Most of Africa and portions of Europe and Asia can be seen in this photograph taken from the Apollo 11 spacecraft during its translunar coast toward the moon. Apollo 11 was already 98,000 nautical miles from Earth when this picture was made on July 17th, 1969. (NASA) #

Arriving and entering into Lunar orbit. Seen below are craters Sabine and Ritter, and mountains stretching back to the horizon on July 19th, 1969. (NASA) #

Looking down at the Command and Service Module (center), with the Moon's surface below, as seen from the now-separated Lunar Module (LM), on its way to the surface. The proiminent crater is Schmidt crater. This is the last photo taken from the LM prior to the powered descent, and eventually the landing one orbit later. (NASA) #

Television footage of the first human footstep on Lunar soil on July 20, 1969. Astronaut Neil Armstrong took these first steps, followed shortly by Buzz Aldrin. This is a reproduction of the television image that was transmitted to the world on July 20th, 1969. (NASA) #

A close-up view of astronaut Buzz Aldrin's boot and bootprint in the lunar soil, photographed with a 70mm lunar surface camera during the Apollo 11 lunar surface extravehicular activity (EVA) on July 20th, 1969. (NASA) #

Astronaut Buzz Aldrin on his way to the Lunar surface for the LM on July 20th, 1969. (NASA) #

Buzz Aldrin took this picture of Neil Armstrong in the cabin after the completion of the first EVA. This is the face of the first man to set foot on the Moon, just hours earlier, on July 20th, 1969. (NASA) #

From Wikipedia contributor Rufus330Ci: "This is a picture of my mother holding the Washington News Paper on Monday, July 21st 1969 stating 'The Eagle Has Landed Two Men Walk on the Moon'. The photo was taken by my grandfather Jack Weir (1928-2005)" #

During their 2 1/2 hour EVA, Astronauts deployed a number of science experiments. Here, Buzz Aldrin is seen carrying the Laser Ranging Retroreflector Experiment (LRRR) and a seismometer to measure Moonquakes. (NASA) #

Close-up of the north footpad of the Lunar Module, with some lunar soil piled up beneath, evidence of a tiny amount of drift during the landing. (NASA) #

Astronaut Buzz Aldrin, photographed by Neil Armstrong (visible in reflection). Buzz Aldrin: "As I walked away from the Eagle Lunar Module, Neil said 'Hold it, Buzz', so I stopped and turned around, and then he took what has become known as the 'Visor' photo. I like this photo because it captures the moment of a solitary human figure against the horizon of the Moon, along with a reflection in my helmet's visor of our home away from home, the Eagle, and of Neil snapping the photo. Here we were, farther away from the rest of humanity than any two humans had ever ventured. Yet, in another sense, we became inextricably connected to the hundreds of millions watching us more than 240,000 miles away. In this one moment, the world came together in peace for all mankind." (quoted with permission from Apollo Through the Eyes of the Astronauts). (NASA) #

Post-deployment documentation photo of the Laser Ranging Retroreflector Experiment (LRRR). For the past 40 years, the retroreflectors were used in conjunction with a dedicated facility at the McDondald Observatory in Texas to accurately measure the distance to the Moon. These experiments discovered, among other things, that the moon is moving away from Earth at a rate of 2.5 inches per year. The National Science Foundation recently terminated funding for the McDonald Laser ranging station, with continued measuements to be made by two other facilities. (NASA) #

View of Earth above the Lunar Module on July 20th, 1969. (NASA). #

Interior view of the Mission Operations Control Room (MOCR) in the Mission Control Center (MCC), Building 30, during the Apollo 11 lunar extravehicular activity (EVA). The television monitor shows astronauts Neil A. Armstrong and Edwin E. Aldrin Jr. on the surface of the moon, July 20, 1969. (NASA) #

Panorama of the view out Buzz Aldrin's window over the thrusters after the EVA. (NASA) #

A memorial plaque, attached to a leg of the Lunar Module. The plaque reads: "Here Men From The Planet Earth First Set Foot Upon the Moon, July 1969 A.D. We Came in Peace For All Mankind." (NASA) #

A bright halo around the shadow of Buzz Aldrin's helmet, the sun directly behind his head. (NASA) #

After lifting off from the Moon, Eagle approaches the Command Module during rendezvous. Astronaut Michael Collins, who remained on board the Command Module for the entire trip, remembers taking this photograph: "Little by little, they grew closer, steady, as if on rails, and I thought 'What a beautiful sight,'one that had to be recorded. As I reached for my Hasselblad, suddenly the Earth popped up over the horizon, directly behind Eagle. I could not have staged it any better, but the alignment was not of my doing, just a happy coincidence. I suspect a lot of good photography is like that, some serendipitous happenstance beyond the control of the photographer. But at any rate, as I clicked away, I realized that for the first time, in one frame, appeared three billion earthlings, two explorers, and one moon. The photographer, of course, was discreetly out of view." (quoted with permission from Apollo Through the Eyes of the Astronauts) (NASA) #

This view of the whole full moon was photographed from the Apollo 11 spacecraft during its trans-Earth journey homeward. When this picture was taken, the spacecraft was already 10,000 nautical miles away, on July 21st, 1969. (NASA) #

A black and white photograph of the Earth taken during the trip home from the Moon. (NASA) #

Apollo 11 crew and a Navy diver await pickup after a safe splashdown east of Wake Island in the Pacific Ocean on July 24th, 1969. (NASA) #

Astronauts Armstrong, Collins, and Aldrin (left to right) in their isolation van on-board the recovery ship U.S.S Hornet are greeted by U.S. President Richard M. Nixon on July 24th, 1969. (NASA) #

New York City welcomes Apollo 11 crewmen in a showering of ticker tape down Broadway and Park Avenue in a parade termed as the largest in the city's history on August 13, 1969. Pictured in the lead car, from the right, are astronauts Neil A. Armstrong, commander; Michael Collins, command module pilot; and Edwin E. "Buzz" Aldrin Jr., lunar module pilot. (NASA) #