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A footprint left by one of the astronauts of the Apollo 11 mission shows in the soft, powder surface of the moon on July 20, 1969. Commander Neil A. Armstrong and Air Force Col. Edwin E. "Buzz" Aldrin Jr. became the first men to walk on the moon after blastoff from Cape Kennedy, Fla., on July 16, 1969. They headed back home from the lunar surface on July 21, 1969. The end of man's first voyage to another planet ended with a splashdown 950 miles southwest of Hawaii, thus achieving President John F.Kennedy's challenge to land men on the moon before the end of the 1960s. (AP Photo/NASA) ( FOOTPRINT ON MOON )

Neil A. Armstrong,Michael Collins Edwin "Buzz" E. Aldrin, Jr. NASA

The Project Apollo 11 blastoff to the moon from Cape Kennedy, Florida, July 16, 1969. (AP Photo/NASA) ( APOLLO 11 LAUNCH )

This photo, taken July 16, 1969, shows Apollo 11 crew members, led by Neil Armstrong, heading for the van that will take them to the rocket for the launch to the moon. (AP Photo/NASA) ( APOLLO 11 CREW )

A view of the Apollo Command Module with astronaut Michael Collins aboard as seen from the Lunar Module, July 20, 1969. Astronauts Neil Armstrong and Edwin Aldrin in the Lunar Module have separated from Apollo 11 and prepare to go to the lunar surface. Moon terrain in background is the far side of the moon. (AP Photo/NASA) ( APOLLO 11 MOON LANDING )

595px-Apollo 11 insignia. NASA

The Apollo 11 lunar module rises from the moon's surface for docking with the command module and the trip back to earth, July 20, 1969. The earth can be seen rising in the background. (AP Photo/NASA) ( APOLLO 11 MOON LANDING )

The Apollo 11 Lunar Module ascent stage is photographed from the command service module during rendezvous in lunar orbit, July 20, 1969. The large dark colored area in the background is Smith's Sea. The Earth rises above the lunar horizon. (AP Photo/NASA) ( APOLLO 11 LUNAR LANDING )

This photograph of astronaut Neil A. Armstrong, Apollo 11 commander, was taken inside the Lunar Module while it rested on the lunar surface, July 20, 1969. Astronauts Armstrong and Edwin E. Aldrin Jr., lunar module pilot, had already completed their extravehicular activity when this picture was made. (AP Photo/NASA) ( APOLLO 11 MOON LANDING )

Astronaut Michael Collins wears the space helmet for the Apollo 11 moon mission, on July 20, 1969. He?ll be in the command module when fellow astronauts Neil Armstrong and Edwin Aldrin Jr. descend on the lunar surface in the lunar module to take a walk on the moon early Monday. (AP Photo) ( Michael Collins )

Astronaut Edwin E. Aldrin Jr., lunar module pilot, is photographed walking near the lunar module during the Apollo 11 extravehicular activity on July 20, 1969. A LM floor pad is at lower right. (AP Photo/NASA/Neil A. Armstrong) ( MOON WALK )

Astronaut Edwin E. Aldrin, Jr., lunar module pilot, descends steps of Lunar Module ladder as he prepares to walk on the moon, July 20, 1969. This picture was taken by astronaut Neil A. Armstrong, Commander, with a 70mm surface camera. (AP Photo/NASA/Neil A. Armstrong) ( APOLLO 11 LUNAR LANDING )

Astronaut Edwin "Buzz" Aldrin, the second man to walk on the moon, poses for fellow astronaut Neil Armstrong, who shot this photo during their moon walk July 20, 1969. Armstrong and the Apollo 11 lunar module are reflected in Aldrin's visor. (AP/Neil Armstrong, NASA) ( APOLLO 11 ALDRIN )

Astronaut Edwin E. Aldrin Jr., lunar module pilot, prepares to deploy the Early Apollo Scientific Experiments Package (EASEP) during the Apollo 11 lunar surface extravehicular activity, July 20, 1969. Astronaut Neil A. Armstrong, commander, took this photograph with a 70 mm lunar surface camera. During flight the EASEP is stowed in the Lunar Module scientific bay at the left rear quadrant of the descent stage looking forward. Aldrin is removing the EASEP from its stowed position. (AP Photo/NASA) ( Moon Landing 40th Anniversary )

Edwin "Buzz" Aldrin carries scientific experiments to a deployment site south of the lunar module Eagle. One experiment involved the inner composition of the moon, and another tried to determine the exact distance from Earth. Photo was taken by Neil Armstrong of the Apollo 11 mission on July 20, 1969. (AP Photo/NASA/Neil Armstrong) ( ALDRIN LUNAR WALK )

Astronaut Edwin E. Aldrin Jr. walks on the surface of the moon, July 30, 1969, with seismogaphic equipment which he just set up. The flag like object on a pole is a solar wind experiment and in the background is the Lunar Landing Module. (AP Photo/NASA/Neil Armstrong) (AP Photo/NASA/Neil Armstrong) ( APOLLO 11 ALDRIN )

Astronauts Neil Armstrong, left, and Edwin E. Aldrin, Jr., place an American flag on the surface of the moon Sunday July 20, 1969, near the lunar lander that brought them to the lunar surface. This picture was received at Goldstone tracking station and released early today July 21, 1969 at Jet Propulsion Laboratory in Pasadena, Calif. (AP Photo/NASA) ( APOLLO 11 )

Photographed by Apollo 11 commander Neil A. Armstrong, astronaut Edwin E. Aldrin Jr. walks the moon on July 20, 1969 after the two became the first men to land on the bleak planet. The lunar samples returned to earth by them and five other Apollo teams are slowly revealing the moon?s secrets and providing clues on the early history of the earth and solar system. (AP Photo/NASA) ( Edwin E. Aldrin Jr. Walks the Moon )

Apollo 11 astronaut Neil Armstrong, right, trudges across the surface of the moon leaving behind footprints, July 20, 1969. 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. (AP Photo) ( APOLLO 11 ARMSTRONG ALDRIN 1969 )

Apollo 11 astronaut Neil Armstrong steps on surface of the moon on July 20, 1969. (AP Photo) ( Apollo 11 Moon Landing )

Apollo 11 Commander Neil Armstrong walks slowly away from the lunar module to explore the surface of the moon, July 20, 1969. (AP Photo) ( APOLLO 11 ARMSTRONG 1969 )

Apollo 11 splashdown in the Pacific Ocean, July 24, 1969. (AP Photo) ( Apollo 11 Splashdown in Pacific )

After an eight day mission on the moon, the Apollo 11 command module lands in the Pacific Ocean and is about to be safely recovered by U.S. Navy helicopters on July 24, 1969. (AP Photo) ( APOLLO 11 SPLASHDOWN )

After an eight day mission on the moon, the Apollo 11 command module lands in the Pacific Ocean and is about to be safely recovered by U.S. Navy helicopters on July 24, 1969. (AP Photo) ( APOLLO 11 SPLASHDOWN )

After an eight day mission on the moon, the Apollo 11 command module lands in the Pacific Ocean and is about to be safely recovered by U.S. Navy helicopters on July 24, 1969. (AP Photo) ( APOLLO 11 SPLASHDOWN )

After an eight day mission on the moon, the Apollo 11 command module lands in the Pacific Ocean and the crew waits to be picked up by U.S. Navy personnel on July 24, 1969. (AP Photo) ( APOLLO 11 SPLASHDOWN )

Apollo 11 crew boarding a recovery helicopter, July 24, 1969. (AP Photo) ( Apollo 11 Recovery )

Apollo 11 crew leaving recovery helicopter, July 24, 1969. (AP Photo) ( Apollo 11 Crew Recovery )

U.S. Navy personnel, protected by Biological Isolation Garments, are recovering the Apollo 11 crew from the re-entry vehicle, which landed safely in the Pacific Ocean on July 24, 1969, after an eight day mission on the moon. (AP Photo) ( Apollo 11 Crew Recovery )

U.S. Navy personnel, protected by Biological Isolation Garments, are recovering the Apollo 11 crew from the re-entry vehicle, which landed safely in the Pacific Ocean on July 24, 1969, after an eight day mission on the moon. (AP Photo) ( Apollo 11 Crew Recovery )

U.S. Navy personnel, protected by Biological Isolation Garments, are recovering the Apollo 11 crew from a re-entry vrehicle, which landed safely in the Pacific Ocean on July 24, 1969, after an eight day mission on the moon. (AP Photo) ( APOLLO 11 SPLASHDOWN )

Apollo 11 astronaut Neil Armstrong, scheduled to be the first man to set foot on the moon, is in his space helmet, July 20, 1969. (AP Photo/NASA) ( Neil Armstrong 1969 )

Thousands of newsmen and photographers line the banks of a lagoon at the Cape Kennedy Press Site on July 16, 1969 as the Saturn 5 Rocket with Apollo 11 astronauts aboard thunders from its launch pad three and a half miles away. ( Apollo 11 )

Ricky Armstrong, 12, takes the flag from the holder and waves it back and fort in front of his home on July 20, 1969 in Houston after his dad, Apollo 11 Astronaut Neil Armstrong and fellow spaceman Edwin E. Aldrin landed on the moon. (AP Photo) ( Rick Armstrong , Son of Astronaut Neil Armstrong Waving Flag )

Mark Armstrong, six-year-old son of Apollo 11 Astronaut Neil Armstrong, picks up the morning paper at the family home near the Manned Spacecraft Center in Houston, Texas on July 20, 1969. Headlines proclaim the big day for all the world when his dad is scheduled to be the first man to set foot on the moon. (AP Photo) ( Mark Armstrong Son of Astronaut Neil Armstrong News Paper )

Mrs. Joan Aldrin, wife of Apollo 11 Astronaut Edwin E. Aldrin, leaves a beauty salon after getting a new hairdo in Houston on July 15, 1969. Photographers on hand to make her picture are reflected in the shop window. Mrs. Aldrin went to the beauty salon in afternoon near the Manned Spacecraft Center in Houston, Texas. (AP Photo) ( Joan Aldrin Wife Astronaut Edwin E Aldrin )

Mrs. Pat Collins, left, wife of Apollo 11 Astronaut Michael Collins, and her sister, Mrs. Bernard Golden of Boston, Mass., walk through a shopping center near the Manned Spacecraft Center, Houston, Tex., July 15, 1969 after visiting a beauty salon. Mrs. Collins plans to watch the launch of Apollo 11 at her home nearby. (AP Photo) ( Mrs. Pat Collins and Her Sister Mrs. Bernard Golden )

U.S. Rangers, their faces painted with grease, listen to the Apollo 11 radio broadcast at Tan An in the Mekong Delta before setting out on a dawn raid of enemy hideouts in Long An province, north of Saigon, July 20, 1969. in left foreground, wearing sweatband is S/4 Tom Dineen, Annapolis, Md. Others, from left, are Sgt. John McBride, Meriden, Conn., Sgt. William Christiansen, Des Plaines, Ill.; Sgt. Norman Breece, South Sioux City, Neb.,carrying radio on back,; S/4 S. Valente, San Diego, Calif., and Spec. 4 Chris Root, Prosser, Wash. (AP Photo) ( Vietnam 1969 )