This March 30, 1969 photo made available by NASA shows the crew of the Apollo 11, from left, Neil Armstrong, commander; Michael Collins, module pilot; Edwin E. "Buzz" Aldrin, lunar module pilot. Apollo 11 was the first manned mission to the surface of the moon.

In this July 16, 1969 photo made available by NASA, the 363-feet Saturn V rocket carrying the Apollo 11 crew, launches from Pad A, Launch Complex 39, at the Kennedy Space Center in Florida.

In this July 21, 1969 photo made available by NASA, the Apollo 11 Lunar Module ascent stage, carrying astronauts Neil Armstrong and Buzz Aldrin, approaches the Command and Service Modules for docking in lunar orbit. Astronaut Michael Collins remained with the CSM in lunar orbit while the other two crewmen explored the moon's surface. In the background the Earth rises above the lunar horizon.

In this July 20, 1969 photo made available by NASA, the Apollo 11 Lunar Module undocks from the Command Module on its way to the surface of the moon.

In this July 21, 1969 photo made available by NASA, astronaut Neil Armstrong, Apollo 11 commander, sits inside the Lunar Module after he and Buzz Aldrin completed their extravehicular activity on the surface of the moon.

This July 20, 1969 photo made available by NASA shows crater Daedalus and Daedalus B, center left, during the Apollo 11 mission to reach the surface of the moon.

This July 16, 1969 photo made available by NASA shows the Earth as the Apollo 11 mission heads to the moon.

In this July 20, 1969 photo made available by NASA, Apollo 11 astronaut Buzz Aldrin works on a solar wind experiment device on the surface of the moon.

In this July 20, 1969 photo made available by NASA, astronaut Buzz Aldrin Jr. descends a ladder from the Lunar Module during the Apollo 11 mission.

In this July 20, 1969 photo made available by NASA, astronaut Buzz Aldrin Jr. poses for a photograph beside the U.S. flag on the moon during the Apollo 11 mission. Aldrin and fellow astronaut Neil Armstrong were the first men to walk on the lunar surface with temperatures ranging from 243 degrees above to 279 degrees below zero. Astronaut Michael Collins flew the command module.

In this July 20, 1969 photo made available by NASA, astronaut Buzz Aldrin, lunar module pilot, walks on the surface of the moon near the leg of the Lunar Module "Eagle" during the Apollo 11 extravehicular activity.

In this July 20, 1969 photo made available by NASA, astronaut Buzz Aldrin Jr. stands next to the Passive Seismic Experiment device on the surface of the the moon during the Apollo 11 mission.

This July 20, 1969 photo made available by NASA shows Buzz Aldrins boot and bootprint during a test of the lunar soil during the Apollo 11 extravehicular activity.

In this July 20, 1969 image made from television, Apollo 11 astronaut Neil Armstrong steps onto the surface of the moon. Millions on Earth who gathered around the TV and radio heard Armstrong say this: “That's one small step for man, one giant leap for mankind.” But after returning from space, he immediately insisted that he had been misquoted. He said there was a lost word in his famous one-liner from the moon: “That's one small step for ‘a' man." It's just that people just didn't hear it.”

In this July 20, 1969 image made from television, Apollo 11 astronaut Neil Armstrong, right, trudges across the surface of the moon leaving behind footprints. The U.S. flag, planted on the surface by the astronauts, can be seen between Armstrong and the lunar module. Edwin E. Aldrin is seen closer to the craft. The men reported the surface of the moon was like soft sand and they left footprints several inches deep wherever they walked.

In this July 16, 1969 file photo, people watch the Apollo 11 Saturn V rocket launch on multiple TV's at a Sears department store in White Plains, N.Y.

In this July 21, 1969 file photo, U.S. Air Force Sgt. Michael Chivaris, Clinton, Mass.; Army Spec. 4 Andrew Hutchins, Middlebury, Vt.; Air Force Sgt. John Whalin, Indianapolis, Ind.; and Army Spec. 4 Lloyd Newton, Roseburg, Ore., read a newspaper headlining the Apollo 11 moon landing, in downtown Saigon, Vietnam.

In this July 21, 1969 file photo, a family in Tokyo watches TV showing U.S. President Richard Nixon superimposed on a live broadcast of the Apollo 11 astronauts saluting from the moon.

In this July 24, 1969 photo from the U.S. Navy, Navy UDT swimmer Clancy Hatleberg prepares to jump from a helicopter into the water next to the Apollo 11 capsule after it splashed down in the Pacific Ocean, to assist the astronauts into the raft at right.

In this July 24, 1969 file photo, President Richard Nixon gives an "OK" sign as he greets Apollo 11 astronauts Neil Armstrong, Michael Collins, and Buzz Aldrin in a quarantine van aboard the USS Hornet after splashdown and recovery in the Pacific Ocean.

In this Aug. 13, 1969 file photo, people line 42nd Street in New York to cheer Apollo 11 astronauts, in lead car from left, Buzz Aldrin, Michael Collins and Neil Armstrong, traveling east on 42nd street, towards the United Nations.

In this June 25, 1970 file photo, Mike Collins, the third man of the Apollo 11 moon landing mission, sits at his State Department desk in Washington. "Any time one changes jobs and scenes it's a little new and strange," said the former astronaut. After six months, he said he feels quite comfortable - and he has trophies on the wall behind him to help him feel at home.

In this Aug. 16, 1969 file photo, Apollo 11 astronaut Buzz Aldrin waves from a convertible during a parade in Houston. Aldrin had a long list of accomplishments by the time NASA chose him for the third astronaut group in 1963: third in his class at West Point, fighter pilot in Korea, Air Force officer, a doctorate in astronautics. He was dubbed Dr. Rendezvous for his expertise in orbital dockings.

In this Sept. 5, 1969 file photo, Apollo 11 astronaut Neil Armstrong, right, stands with his family after arriving at his parents' home in Wapakoneta, Ohio. This is his first trip home since his historic walk on the moon. With him from left are, Stephen Armstrong, father; Neil's wife, Janet; his mother, and two children, Mark, left, 6, and Eric, 12. A big homecoming celebration was planned for the next day. Armstrong left NASA two years after Apollo 11 and taught engineering at the University of Cincinnati until 1979. He spent his remaining years in his home state of Ohio.

In this July 27, 1969 file photo, Apollo 11 crew members, from left, Neil Armstrong, Buzz Aldrin and Michael Collins sit inside a quarantine van in Houston.