This July 21, 1969 photo made available by NASA shows Tranquility Base and the U.S. flag from a window on the Lunar Module as Neil Armstrong and Buzz Aldrin prepare for liftoff from the surface of the moon. (NASA via AP)
FILE - 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. (AP Photo/File)
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. (Michael Collins/NASA via AP)
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. (Neil Armstrong/NASA via AP)
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. (Buzz Aldrin/NASA via AP)
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. (Michael Collins/NASA via AP)
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. (Neil Armstrong/NASA via AP)
FILE - In this July 16, 1969 file photo, from right, Neil Armstrong, Michael Collins and Buzz Aldrin walk to the van that will take the crew to the launchpad at Kennedy Space Center on Merritt Island, Florida. (AP Photo/File)
In this July 20, 1969 photo made available by NASA, astronaut Buzz Aldrin, lunar module pilot, walks on the surface of the moon during the Apollo 11 extravehicular activity. (Neil Armstrong/NASA via AP)
People watch the Apollo 11 Saturn V rocket launch on TV's (not shown) at a Sears department store in White Plains, N.Y., July 16, 1969. (AP Photo/Ron Frehm)
People watch the Apollo 11 Saturn V rocket launch on multiple TV's at a Sears department store in White Plains, N.Y., July 16, 1969. (AP Photo/Ron Frehm)
The Chicago Cubs (foreground) and the Philadelphia Phillies and the fans in the stands in Philadelphia, July 20, 1969, bow their heads in a moment of silent prayer for the safe completion of the Apollo 11 mission to the moon. The players moved out on the field within the minute after the "Eagle" lunar module made its safe landing. The fans who had cheered wildly on hearing announcement of landing then joined the players in singing "God Bless America," before resuming playing of second game of the day's doubleheader. (AP Photo/Bill Ingraham)
A family in Moscow, Russia, watch brief taped excerpts on Soviet television from the Apollo 11 moon landing broadcast, July 21, 1969. An unidentified astronaut is at left on screen, and a U.S. flag is the bright object at right. Tape was shown four hours after the moon walk began. (AP Photo/Vaslili Semenovich Gritsan)
People watch the Apollo 11 Saturn V rocket launch on multiple TV's at a Sears department store in White Plains, N.Y., July 16, 1969. (AP Photo/Ron Frehm)
People watch the Apollo 11 Saturn V rocket launch on multiple TV's at a Sears department store in White Plains, N.Y., July 16, 1969. (AP Photo/Ron Frehm)
People watch the Apollo 11 Saturn V rocket launch on multiple TV's at a Sears department store in White Plains, N.Y., July 16, 1969. (AP Photo/Ron Frehm)
Scores of Italian and American residents watch the launch of the Apollo 11 Saturn V rocket on a TV set placed outside the United States Information Service (USIS) headquarters on the fashionable Via Veneto in Rome, Italy, July 16, 1969. (AP Photo/Claudio Luffoli)
A Japanese woman watches her TV screen as President Richard Nixon is superimposed on a live TV broadcast of the Apollo 11 astronauts salute from the Moon, July 21, 1969, Tokyo, Japan. The woman is unidentified. (AP Photo)
A Japanese family watch their TV screen as President Richard Nixon is superimposed on a live TV Broadcast of the Apollo 11 astronauts salute from the Moon, July 21, 1969, Tokyo, Japan. The family is unidentified. (AP Photo)
A sidewalk cafe in the center of Milan, Italy, has placed a TV set outdoors to follow the 24 hour program the Italian Radio and Television Service (RAI) arranged to follow the Apollo 11 astronaut's moon landing, July 20, 1969. Few people went to bed during the night as hundreds gathered in front of the many outdoor TV sets to take advantage of the cooler night air. (AP Photo)
American servicemen pause on a downtown Saigon, Vietnam street to read a local newspaper account of the Apollo 11 lunar landing, July 21, 1969. From left are 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, Org. (AP Photo/Hugh Van Es)
People gather in front of the Central Photo Agency office in Warsaw, Poland to view prints exhibited of the landing of Apollo 11 and U.S. astronauts on the moon's surface, July 21, 1969. (AP Photo/Central Photo Agency)
FILE - In this July 20, 1969 file photo, a crowd watches, as the Apollo 11 crew lands on the moon, in Central Park, New York. (AP Photo/Marty Lederhandler, file)
A crowd watches as the Apollo 11 crew lands on the moon, July 20, 1969, Central Park, New York. (AP Photo/Marty Lederhandler)
Excited fans stand and cheer when an announcement came over the public address system of a safe lunar landing for the "Eagle" Apollo 11, during the Philadelphia Phillies, Chicago Cubs doubleheader baseball game, at Connie Mack Stadium, July 20, 1969, Philadelphia, PA. (AP Photo/Bill Ingraham)
People sit on the lawn of the home of Stephen Armstrong in Wapakoneta, Ohio, to watch astronaut Neil Armstrong walk on the moon on July 20, 1969. The Apollo 11 lunar mission was launched July 16. (AP Photo/Bill Sauro)
An estimated 10,000 persons gather to watch giant television screens in New York's Central Park and cheer as astronaut Neil Armstrong takes man's first step on the moon on July 20, 1969. The Apollo 11 lunar mission was launched July 16. (AP Photo)
Mrs. Jan Armstrong registers pleasure over a picture of her husband, Apollo 11 commander, Neil Armstrong, taken during a telecast from the spacecraft and beamed back to earth, July 18, 1969. In the rear seat is son, Mark, 6. (AP Photo)
Eric Armstrong, whose dad, Neil A. Armstrong is flight commander of Apollo 11 and the first man destined to walk on the moon, puts a flag in the standard at the family home near the Manned Spacecraft Center in Houston, Texas on July 17, 1969. (AP Photo)
A remark by newsmen covering Apollo 11 astronauts' families brought a hearty laugh from Mrs. Jan Armstrong, wife of the flight commander, and smiles from sons, Eric, 12, and Mark, 6, during a news conference at their home near the Manned Spacecraft Center, Houston, Tex., on July 17, 1969. (AP Photo)
Andrew Aldrin, 10, is followed by a group of neighborhood youngsters anxious to see his picture in the newspaper, July 17, 1969 in Houston. The son of Apollo 11 Astronaut and Mrs. Edwin E. Aldrin was the hero of the neighborhood around the Manned Spacecraft Center, Houston, Tex., after his photo appeared in print. (AP Photo)
Mrs. Pat Collins wife of Apollo 11 command module pilot, Michael Collins and their children, Mike, 6; Ann, 7; and Kathleen, 10, gather on the lawn of the family home near the Manned Spacecraft Center in Houston, Texas, July 16, 1969 after the successful launch of Apollo 11 today. (AP Photo)
Mrs. Jan Armstrong, whose husband is scheduled to become the first man on the moon, displayed this wide expression as she described watching the launching at Cape Kennedy on Wednesday, July 16, 1969 in Space Center, Houston. She returned to her home near the Houston Space Center Wednesday evening. (AP Photo)
Bikini clad hostesses of a Tokyo cabaret, led by their manager, shout "Banzai" cheers in Japanese, in front of the U.S. Embassy in Tokyo, July 21, 1969. They were celebrating the successful landing of the Apollo 11 lunar module on the moon. The girls carry signs reading "Congratulation for successful landing on the Moon." The U.S. Embassy is not see in this image. (AP Photo)
Bikini clad hostesses of a Tokyo cabaret, led by their manager, shout "Banzai" cheers in Japanese, in front of the U.S. Embassy in Tokyo, July 21, 1969. They were celebrating the successful landing of the Apollo 11 lunar module on the moon. The girls carry signs reading "Congratulation for successful landing on the Moon." The U.S. Embassy is not see in this image. (AP Photo)