Spectators watch as a lineup of Ford Mustangs carry retired shuttle astronauts and family members of Apollo astronauts during the "Man on the Moon" astronaut parade in Cocoa Beach, Floirida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

A lineup of Ford Mustangs carry retired space shuttle astronauts and family members of Apollo astronauts during the "Man on the Moon" astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

The children of Apollo astronaut Jim Lovell ride in a Ford Mustang during the “Man on the Moon” astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Apollo astronaut Al Worden rides in a classic Corvette during the "Man on the Moon" astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Classic Corvettes are staged before the start of the "Man on the Moon" astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

United Launch Alliance employees march in the "Man on the Moon" astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Corvettes are being staged for the "Man on the Moon" astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA's Saturn V/Apollo 11 launch and landing on the Moon.

Employees with Boeing march in the “Man on the Moon” astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Chris Ferguson rides in a Corvette during the “Man on the Moon” astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Former Astronaut Edwin E. Aldrin exiting the bus that brought him to the Apollo 11 Twentieth Aniversary Picnic at the Gilruth Center.

A child waves an Amercan Flag as Boeing astronaut Chris Ferguson rides by in a Corvette during the “Man on the Moon” astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Retired space shuttle astronaut Anna Fisher rides in a classic Corvette during the "Man on the Moon" astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Retired NASA astronaut Jerry Ross rides in a classic Corvette during the "Man on the Moon" astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA's Saturn V/Apollo 11 launch and landing on the Moon.

One-time shuttle astronaut and former U.S. Senator Bill Nelson rides in a classic corvetter during the "Man on the Moon" astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon

Kennedy Space Center Director and retired astronaut Bob Cabana prepares to ride in a Corvette during the "Man on the Moon" astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Kennedy Space Center Director and retired NASA astronaut Bob Cabana signs the placard on the Corvette he will ride in the "Man on the Moon" astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Kennedy Space Center Director and retired NASA astronaut Bob Cabana rides in a Corvette during the “Man on the Moon” astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Employees from NASA’s Kennedy Space Center prepare to march in the “Man on the Moon” astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Employees from NASA’s Kennedy Space Center march in the “Man on the Moon” astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Employees from NASA’s Kennedy Space Center mingle before the start of the “Man on the Moon” astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

Neil Armstrong's classic Corvette is on display before the start of the "Man on the Moon" astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA's Saturn V/Apollo 11 launch and landing on the Moon.

U.S. Navy active duty color guard open the "Man on the Moon" astronaut parade in Cocoa Beach, Florida, on July 13, 2019. The parade was held to honor the 50th anniversary of NASA’s Saturn V/Apollo 11 launch and landing on the Moon.

AS11-40-5873 (20 July 1969) --- Astronaut Edwin E. Aldrin Jr., lunar module pilot, is photographed during the Apollo 11 extravehicular activity (EVA) on the lunar surface. In the right background is the lunar module. On Aldrin's right is the Solar Wind Composition (SWC) experiment, already deployed. This photograph was taken by astronaut Neil A. Armstrong, commander, with a 70mm lunar surface camera.

AS11-40-5874 (20 July 1969) --- Astronaut Edwin E. Aldrin Jr., lunar module pilot of the first lunar landing mission, poses for a photograph beside the deployed United States flag during Apollo 11 extravehicular activity (EVA) on the lunar surface. The Lunar Module (LM) is on the left, and the footprints of the astronauts are clearly visible in the soil of the moon. Astronaut Neil A. Armstrong, commander, took this picture with a 70mm Hasselblad lunar surface camera. While astronauts Armstrong and Aldrin descended in the LM the "Eagle" to explore the Sea of Tranquility region of the moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) "Columbia" in lunar orbit.

AS11-40-5866 (20 July 1969) --- Astronaut Edwin E. Aldrin Jr., lunar module pilot, egresses the Lunar Module (LM) "Eagle" and begins to descend the steps of the LM ladder as he prepares to walk on the moon. This photograph was taken by astronaut Neil A. Armstrong, commander, with a 70mm lunar surface camera during the Apollo 11 extravehicular activity (EVA). While astronauts Armstrong and Aldrin descended in the LM "Eagle" to explore the moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) "Columbia" in lunar orbit. Photo credit: NASA

Members of the SOFIA infrared observatory support team gather around Apollo 11 astronaut Buzz Aldrin (in red shirt) during Aldrin's tour of NASA Dryden.

A LEGO astronaut is seen at the Apollo 11 50th Anniversary celebration on the National Mall, Thursday, July 18, 2019 in Washington. Apollo 11 was the first mission to land astronauts on the Moon and launched on July 16, 1969 with astronauts Neil Armstrong, Michael Collins, and Buzz Aldrin. Photo Credit: (NASA/Aubrey Gemignani)

Apollo 11 astronaut Buzz Aldrin (left) and Apollo-Soyuz and space shuttle astronaut Vance Brand discuss Dryden's work on an Orion fit-check crew module mockup.

S69-25944 (25 Feb. 1969) --- These two Apollo 11 crew astronauts study rock samples during a geological field trip to the Quitman Mountains area near the Fort Quitman ruins in far west Texas. Neil A. Armstrong (in background) is the Apollo 11 commander; and Edwin E. Aldrin Jr. is the lunar module pilot.

A visitor poses for a photo with NASA astronaut Randy Bresnik at the LEGO exhibit at the Apollo 11 50th Anniversary celebration on the National Mall, Friday, July 19, 2019 in Washington. Apollo 11 was the first mission to land astronauts on the Moon and launched on July 16, 1969 with astronauts Neil Armstrong, Michael Collins, and Buzz Aldrin. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut candidate Zena Cardman greets a visitor at the LEGO exhibit at the Apollo 11 50th Anniversary celebration on the National Mall, Friday, July 19, 2019 in Washington. Apollo 11 was the first mission to land astronauts on the Moon and launched on July 16, 1969 with astronauts Neil Armstrong, Michael Collins, and Buzz Aldrin. Photo Credit: (NASA/Aubrey Gemignani)

NASA astronaut Randy Bresnik speaks at the LEGO exhibit for a video at the Apollo 11 50th Anniversary celebration on the National Mall, Friday, July 19, 2019 in Washington. Apollo 11 was the first mission to land astronauts on the Moon and launched on July 16, 1969 with astronauts Neil Armstrong, Michael Collins, and Buzz Aldrin. Photo Credit: (NASA/Aubrey Gemignani)

S69-35504 (June 1969) --- The prime crews of the Apollo 10 lunar orbit mission and the Apollo 11 lunar landing mission are photographed during an Apollo 10 postflight de-briefing session. Clockwise, from left foreground, are astronauts Michael Collins, Apollo 11 command module pilot; Edwin E. Aldrin Jr., Apollo 11 lunar module pilot; Eugene A. Cernan, Apollo 10 lunar module pilot; Thomas P. Stafford, Apollo 10 commander; Neil A. Armstrong, Apollo 11 commander; and John W. Young, Apollo 10 command module pilot.

S69-35507 (June 1969) --- The prime crews of the Apollo 10 lunar orbit mission and the Apollo 11 lunar landing mission are photographed during an Apollo 10 postflight de-briefing session. Clockwise, from left, are astronauts Michael Collins, Apollo 11 command module pilot; Edwin E. Aldrin Jr., Apollo 11 lunar module pilot; Eugene A. Cernan, Apollo 10 lunar module pilot; Thomas P. Stafford, Apollo 10 commander; Neil A. Armstrong, Apollo 11 commander; and John W. Young, Apollo 10 command module pilot.

NASA astronaut Randy Bresnik, left, and NASA astronaut candidate, Zena Cardman, pose for a photo with the soon to be 20 ft. model of the Space Launch System (SLS) made out of LEGOs, at the Apollo 11 50th Anniversary celebration on the National Mall, Friday, July 19, 2019 in Washington. Apollo 11 was the first mission to land astronauts on the Moon and launched on July 16, 1969 with astronauts Neil Armstrong, Michael Collins, and Buzz Aldrin. Photo Credit: (NASA/Aubrey Gemignani)

Apollo 11 astronaut Buzz Aldrin, the second man to walk on the Moon, seated left, responds to a question during a live television interview on Monday, July 20, 2009, at NASA Headquarters in Washington as Apollo 12 astronaut Alan Bean and Apollo 16 astronaut Charles Duke, right look on. The three sat in for interviews with morning talks shows covering the 40th Anniversary of the Apollo 11 landing on the Moon. Photo Credit: (NASA/Paul E. Alers)

The crowning achievement for the Saturn V rocket came when it launched Apollo 11 astronauts, Neil Armstrong, Edwin (Buzz) Aldrin, and Michael Collins, to the Moon in July 1969. In this photograph, astronaut Aldrin takes his first step onto the surface of the Moon.

CAPE CANAVERAL, Fla. - Kennedy Space Center Director Bob Cabana spoke to spaceport employees and guests at a brief ceremony on Aug. 31, 2012 honoring Neil Armstrong, who died Aug. 25, 2012 at the age of 82. Armstrong was hailed by Cabana as one of our heroes and a truly a great American. Cabana, also a former astronaut, placed a wreath near a replica lunar module at the spaceport's Apollo-Saturn V Center. Selected as an astronaut in 1962, Neil Armstrong flew on NASA's Gemini 8 with David Scott in March 1966 and the first lunar landing mission, Apollo 11, with Mike Collins and Buzz Aldine in July 1969. On July 20, 1969, he became the first human to walk on the moon. For more information, visit: http://www.nasa.gov/centers/kennedy/news/neil_armstrong.html Photo credit: NASA/Kim Shiflett

On the 50th anniversary of the Apollo 11 launch, July 16, 2019, astronaut Michael Collins, left, speaks to Kennedy Space Center Director Bob Cabana in the astronaut crew quarters about the moments leading up to launch at 9:32 a.m. on July 16, 1969, and what it was like to be the first to land on the Moon.

On the 50th anniversary of the Apollo 11 launch, July 16, 2019, astronaut Michael Collins, left, speaks to Kennedy Space Center Director Bob Cabana in the astronaut crew quarters about the moments leading up to launch at 9:32 a.m. on July 16, 1969, and what it was like to be the first to land on the Moon.

On the 50th anniversary of the Apollo 11 launch, July 16, 2019, astronaut Michael Collins speaks to Kennedy Space Center Director Bob Cabana in the astronaut crew quarters about the moments leading up to launch at 9:32 a.m. on July 16, 1969, and what it was like to be the first to land on the Moon.

On the 50th anniversary of the Apollo 11 launch, July 16, 2019, astronaut Michael Collins speaks to Kennedy Space Center Director Bob Cabana in the astronaut crew quarters about the moments leading up to launch at 9:32 a.m. on July 16, 1969, and what it was like to be the first to land on the Moon.

Views of the Apollo 11 Twentieth Anniversary Black Tie reception at the downtown Houston Hyatt Regency Hotel. Views include former JSC Directors Robert Gilruth and Christopher C. Kraft Jr. reminiscing with keynote speaker Walter Cronkite (39934); Apollo astronauts Tom Stafford (left) and Neil Armstrong (right) talk with former Soviet cosmonaut Alexei Leonov (center) at the gala (39935).

CAPE CANAVERAL, Fla. - Kennedy Space Center employees and guests gathered for a brief ceremony on Aug. 31, 2012 honoring Neil Armstrong, who died Aug. 25, 2012 at the age of 82. Armstrong was hailed by Center Director Bob Cabana as one of our heroes and a truly a great American. Cabana placed a wreath near a replica lunar module at the spaceport's Apollo-Saturn V Center. Selected as an astronaut in 1962, Neil Armstrong flew on NASA's Gemini 8 with David Scott in March 1966 and the first lunar landing mission, Apollo 11, with Mike Collins and Buzz Aldine in July 1969. On July 20, 1969, he became the first human to walk on the moon. For more information, visit: http://www.nasa.gov/centers/kennedy/news/neil_armstrong.html Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Kennedy Space Center employees and guests gathered for a brief ceremony on Aug. 31, 2012 honoring Neil Armstrong, who died Aug. 25, 2012 at the age of 82. Armstrong was hailed by Center Director Bob Cabana as one of our heroes and a truly a great American. Cabana placed a wreath in the spaceport's Apollo-Saturn V Center. Selected as an astronaut in 1962, Neil Armstrong flew on NASA's Gemini 8 with David Scott in March 1966 and the first lunar landing mission, Apollo 11, with Mike Collins and Buzz Aldine in July 1969. On July 20, 1969, he became the first human to walk on the moon. For more information, visit: http://www.nasa.gov/centers/kennedy/news/neil_armstrong.html Photo credit: NASA/Kim Shiflett

CAPE CANAVERAL, Fla. - Kennedy Space Center employees and guests gathered for a brief ceremony on Aug. 31, 2012 honoring Neil Armstrong, who died Aug. 25, 2012 at the age of 82. Armstrong was hailed by Center Director Bob Cabana as one of our heroes and a truly a great American. Cabana placed a wreath in the spaceport's Apollo-Saturn V Center. Selected as an astronaut in 1962, Neil Armstrong flew on NASA's Gemini 8 with David Scott in March 1966 and the first lunar landing mission, Apollo 11, with Mike Collins and Buzz Aldine in July 1969. On July 20, 1969, he became the first human to walk on the moon. For more information, visit: http://www.nasa.gov/centers/kennedy/news/neil_armstrong.html Photo credit: NASA/Kim Shiflett

On the 50th anniversary of the Apollo 11 launch, July 16, 2019, Michael Collins stands in the suit-up room in the astronaut crew quarters at NASA’s Kennedy Space Center in Florida, just as he did 50 years ago today.

On the 50th anniversary of the Apollo 11 launch, July 16, 2019, Michael Collins stands in the suit-up room in the astronaut crew quarters at NASA’s Kennedy Space Center in Florida, just as he did 50 years ago today.

Apollo 11 astronaut Buzz Aldrin autographs NASA Dryden's F-16XL research aircraft, as his crewmate Neil Armstrong had previously done on the other side.

AS11-40-5931 (20 July 1969) --- Astronaut Edwin E. Aldrin Jr., lunar module pilot, prepares to deploy the Early Apollo Scientific Experiments Package (EASEP) on the surface of the moon during the Apollo 11 extravehicular activity. Astronaut Neil A. Armstrong, commander, took this photograph with a 70mm lunar surface camera. In the foreground is the Apollo 11 35mm stereo close-up camera.

Apollo astronaut Alan Bean, center, laughs at a comment made by Apollo astronaut Charles Duke, right, as Apollo astronaut Buzz Aldrin, left, looks on during a live television interview on Monday, July 20, 2009, at NASA Headquarters in Washington. Monday marked the 40th Anniversary of the historic landing of Apollo 11 on the Moon. Photo Credit: (NASA/Paul E. Alers)

On the 50th anniversary of the Apollo 11 launch, July 16, 2019, astronaut Michael Collins, left, and Kennedy Space Center Director Bob Cabana exit the astronaut crew quartaers. Collins is speaking to Cabana about the moments leading up to launch at 9:32 a.m. on July 16, 1969, and what it was like to be the first to land on the Moon.

S69-39334 (July 1969) --- This is a replica of the plaque which the Apollo 11 astronauts will leave behind on the moon in commemoration of the historic event. The plaque is made of stainless steel, measuring nine by seven and five-eighths inches, and one-sixteenth inch thick. The plaque will be attached to the ladder on the landing gear strut on the descent stage of the Apollo 11 Lunar Module (LM). Covering the plaque during the flight will be a thin sheet of stainless steel which will be removed on the lunar surface.

AS11-40-5899 (20 July 1969) --- Close-up view of the plaque which the Apollo 11 astronauts left on the moon in commemoration of the historic lunar landing mission. The plaque was attached to the ladder on the landing gear strut on the descent stage of the Apollo 11 Lunar Module (LM). The plaque was covered with a thin sheet of stainless steel during flight. Astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) in lunar orbit while astronauts Neil A. Armstrong, commander, and Edwin E. Aldrin Jr., lunar module pilot, explored the moon.

Adam Savage, maker and host of Savage Builds, left, introduces NASA Spacesuit Engineer, Lindsay Aitchison, center, and NASA astronaut Randy Bresnik, during “NASA’s Giant Leaps: Past and Future," a live television program on Friday, July 19, 2019 on the National Mall in Washington. NASA and the world are recognizing the 50th anniversary of Apollo 11, in which astronauts Neil Armstrong, Michael Collins, and Buzz Aldrin crewed the first mission to land astronauts on the Moon. Photo Credit: (NASA/Aubrey Gemignani)

Apollo 11 Astronauts, from left, Michael Collins, Neil Armstrong, Buzz Aldrin and NASA Administrator Charles Bolden attend the U.S House of Representatives Committee on Science and Technology tribute to the Apollo 11 Astronauts at the Cannon House Office Building on Capitol Hill, Tuesday, July 21, 2009 in Washington. The Committee presented the three Apollo 11 astronauts with a framed copy of House Resolution 607 honoring their achievement, and announced passage of legislation awarding them and John Glenn the Congressional Gold Medal. Photo Credit: (NASA/Bill Ingalls)

Apollo 11 astronaut Buzz Aldrin and tour guide Mary Ann Harness check out models of the Ares 1 and Ares 5 space vehicles during Aldrin's tour of NASA Dryden.

Apollo 11 astronaut Buzz Aldrin tries out the control station for the X-48B Blended Wing Body unmanned subscale demonstrator during a tour of NASA Dryden.

Former Apollo 11 astronaut Michael Collins speaks during the "National Symphony Orchestra Pops, Apollo 11: A 50th Anniversary, One Small Step, One Giant Leap" a program including musical acts, speakers, and images and video related to space, on Saturday, July 20, 2019 at the John F. Kennedy Center for the Performing Arts in Washington. NASA and the country are recognizing the 50th anniversary of Apollo 11, in which astronauts Neil Armstrong, Michael Collins, and Buzz Aldrin crewed the first mission to land astronauts on the Moon. Photo Credit: (NASA/Aubrey Gemignani)

Former Apollo 11 astronaut Michael Collins speaks during the "National Symphony Orchestra Pops, Apollo 11: A 50th Anniversary, One Small Step, One Giant Leap" a program including musical acts, speakers, and images and video related to space, on Saturday, July 20, 2019 at the John F. Kennedy Center for the Performing Arts in Washington. NASA and the country are recognizing the 50th anniversary of Apollo 11, in which astronauts Neil Armstrong, Michael Collins, and Buzz Aldrin crewed the first mission to land astronauts on the Moon. Photo Credit: (NASA/Aubrey Gemignani)

Apollo astronauts from left, Walt Cunningham (Apollo 17), James Lovell (Apollo 8 Apollo 13), David Scott (Apollo 9 Apollo 15), Buzz Aldrin (Apollo 11), Charles Duke (Apollo 16), Thomas Stafford (Apollo 10) and Eugene Cernan (Apollo 17) are seen during the 40th anniversary of the Apollo 11 mission and the walk on the moon press conference, Monday, July 20, 2009, at NASA Headquarters in Washington. Photo Credit: (NASA/Paul E. Alers)

Apollo astronauts from left, Walt Cunningham (Apollo 17), James Lovell (Apollo 8 Apollo 13), David Scott (Apollo 9 Apollo 15), Buzz Aldrin (Apollo 11), Charles Duke (Apollo 16), Thomas Stafford (Apollo 10) and Eugene Cernan (Apollo 17) are seen during the 40th anniversary of the Apollo 11 mission and the walk on the moon press conference, Monday, July 20, 2009, at NASA Headquarters in Washington. Photo Credit: (NASA/Paul E. Alers)

Apollo astronauts from left, Walt Cunningham (Apollo 17), James Lovell (Apollo 8 Apollo 13), David Scott (Apollo 9 Apollo 15), Buzz Aldrin (Apollo 11), Charles Duke (Apollo 16), Thomas Stafford (Apollo 10) and Eugene Cernan (Apollo 17) are seen during the 40th anniversary of the Apollo 11 mission and the walk on the moon press conference, Monday, July 20, 2009, at NASA Headquarters in Washington. Photo Credit: (NASA/Paul E. Alers)

Veteran journalist Nick Clooney, seated left, moderated a panel discussion with Apollo 11 astronaut Buzz Aldrin, far right, Charlie Duke of Apollo 16, John Grunsfeld, of the recent Hubble mission, and Goddard Space Flight Center deputy director Laurie Leshin, Monday, July 20, 2009, at the Newseum in Washington as part of the commemoration of the 40th Anniversary of the Apollo 11 moon landing. Photo Credit: (NASA/Bill Ingalls)

Astronaut Don Thomas and the crowd cheer at the moment of the Apollo 11 touchdown on the Moon during a replay of the 1969 television broadcast at the Summer Moon Festival, Wapakoneta, Ohio, Apollo 11 Moon Landing 50th Anniversary

On the 50th anniversary of the Apollo 11 launch, July 16, 2019, astronaut Michael Collins, right, speaks to Kennedy Space Center Director Bob Cabana at Launch Complex 39A, about the moments leading up to launch at 9:32 a.m. on July 16, 1969, and what it was like to be the first to land on the Moon.

Apollo 11 astronaut Buzz Aldrin, the second man to walk on the Moon, responds to a question during a live television interview on Monday, July 20, 2009, at NASA Headquarters in Washington. Monday marked the 40th Anniversary of the historic landing. Photo Credit: (NASA/Paul E. Alers)

S70-17433 (13 Aug. 1969) --- 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. Pictured in the lead car, from the right, are astronauts Neil A. Armstrong, commander; Michael Collins, command module pilot; and Edwin E. Aldrin Jr., lunar module pilot. The three astronauts teamed for the first manned lunar landing, on July 20, 1969.

AS11-36-5390 (20 July 1969) --- This interior view of the Apollo 11 Lunar Module (LM) shows astronaut Edwin E. Aldrin Jr., lunar module pilot, during the lunar landing mission. This picture was taken by astronaut Neil A. Armstrong, commander. While astronauts Armstrong and Aldrin descended in the LM "Eagle" to explore the Sea of Tranquility region of the moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) "Columbia" in lunar orbit.

Astronaut Michael Good, Astronaut Sunita Williams prepare for the Run To The Moon Race during the Summer Moon Festival, Wapakoneta, Ohio, Apollo 11 Moon Landing 50th Anniversary

Two members of the Apollo 11 lunar landing mission participate in a simulation of deploying and using lunar tools on the surface of the moon during a training exercise in bldg 9 on April 22, 1969. Astronaut Edwin E. Aldrin Jr. (on left), lunar module pilot, uses scoop and tongs to pick up sample. Astronaut Neil A. Armstrong, Apollo 11 commander, holds bag to receive sample. In the background is a Lunar Module mockup. Both men are wearing Extravehicular Mobility Units (EMU).

AS11-37-5528 (20 July 1969) --- This photograph of astronaut Neil A. Armstrong, Apollo 11 commander, was taken inside the Lunar Module (LM) while the LM rested on the lunar surface. Astronauts Armstrong and Edwin E. Aldrin Jr., lunar module pilot, had already completed their historic extravehicular activity (EVA) when this picture was made. Astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) in lunar orbit while Armstrong and Aldrin explored the moon's surface.

On the 50th anniversary of the Apollo 11 launch, July 16, 2019, astronaut Michael Collins, left, speaks to Kennedy Space Center Director Bob Cabana in the astronaut crew quarters about the moments leading up to launch at 9:32 a.m. on July 16, 1969, and what it was like to be the first to land on the Moon.

On the 50th anniversary of the Apollo 11 launch, July 16, 2019, astronaut Michael Collins, left, speaks to Kennedy Space Center Director Bob Cabana in the astronaut crew quarters about the moments leading up to launch at 9:32 a.m. on July 16, 1969, and what it was like to be the first to land on the Moon.

On the 50th anniversary of the Apollo 11 launch, July 16, 2019, astronaut Michael Collins, left, speaks to Kennedy Space Center Director Bob Cabana in the astronaut crew quarters about the moments leading up to launch at 9:32 a.m. on July 16, 1969, and what it was like to be the first to land on the Moon.

On the 50th anniversary of the Apollo 11 launch, July 16, 2019, astronaut Michael Collins, left, speaks to Kennedy Space Center Director Bob Cabana in the astronaut crew quarters about the moments leading up to launch at 9:32 a.m. on July 16, 1969, and what it was like to be the first to land on the Moon.

Astronaut Edwin E. Aldrin Jr., lunar module pilot, moves toward a position to deploy two components of the Early Apollo Scientific Experiments Package (EASEP) on the surface of the Moon during the Apollo 11 extravehicular activity. The Passive Seismic Experiments Package (PSEP) is in his left hand; and in his right hand is the Laser Ranging Retro-Reflector (LR3). Astronaut Neil A. Armstrong, commander, took this photograph with a 70mm lunar surface camera.

S69-39269 (10 July 1969) --- Astronaut Edwin E. Aldrin Jr., lunar module pilot of the Apollo 11 lunar landing mission, undergoes zero-gravity training aboard a U.S. Air Force KC-135 jet aircraft from nearby Patrick Air Force Base, Florida. Aldrin is wearing an Extravehicular Mobility Unit (EMU), the type of equipment which he will wear on the lunar surface.

AS11-40-5902 (20 July 1969) --- Astronaut Edwin E. Aldrin Jr., lunar module pilot, walks on the surface of the moon near a leg of the Lunar Module during the Apollo 11 extravehicular activity (EVA). Astronaut Neil A. Armstrong, Apollo 11 commander, took this photograph with a 70mm lunar surface camera. The astronauts' bootprints are clearly visible in the foreground. While astronauts Armstrong and Aldrin descended in the Lunar Module (LM) "Eagle" to explore the Sea of Tranquility region of the moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) "Columbia" in lunar orbit.

AS11-40-5927 (20 July 1969) --- 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 (EVA). Astronaut Neil A. Armstrong, commander, took this picture with a 70mm lunar surface camera. During flight the EASEP is stowed in the Lunar Module's (LM) scientific equipment bay at the left year quadrant of the descent stage looking forward. Aldrin is removing the EASEP from its stowed position. Photo credit: NASA

AS11-40-5877 (20 July 1969) --- A close-up view of an astronaut's bootprint in the lunar soil, photographed with a 70mm lunar surface camera during the Apollo 11 extravehicular activity (EVA) on the moon. While astronauts Neil A. Armstrong, commander, and Edwin E. Aldrin Jr., lunar module pilot, descended in the Lunar Module (LM) "Eagle" to explore the Sea of Tranquility region of the moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) "Columbia" in lunar orbit.

AS11-40-5880 (20 July 1969) --- A close-up view of an astronaut's boot and bootprint in the lunar soil, photographed with a 70mm lunar surface camera during the Apollo 11 lunar surface extravehicular activity (EVA). While astronauts Neil A. Armstrong, commander, and Edwin A. Aldrin Jr., lunar module pilot, descended in the Lunar Module (LM) "Eagle" to explore the Sea of Tranquility region of the moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM)" Columbia" in lunar orbit.

AS11-40-5878 (20 July 1969) --- A close-up view of an astronaut's bootprint in the lunar soil, photographed with a 70mm lunar surface camera during the Apollo 11 extravehicular activity (EVA) on the moon. While astronauts Neil A. Armstrong, commander, and Edwin E. Aldrin Jr., lunar module pilot, descended in the Lunar Module (LM) "Eagle" to explore the Sea of Tranquility region of the moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) "Columbia" in lunar orbit.

Astronaut Robert Springer congratulates who earned a medal in the 1-mile Fun Run during the Summer Moon Festival, Wapakoneta, Ohio, Apollo 11 Moon Landing 50th Anniversary, Run To The Moon Race

Astronaut Sunita Williams crosses the finish line of the Run To The Moon Race during the Summer Moon Festival, Wapakoneta, Ohio, Apollo 11 Moon Landing 50th Anniversary

AS11-40-5964 (20 July 1969) --- Astronaut Edwin E. Aldrin Jr., lunar module pilot, is photographed during the Apollo 11 extravehicular activity (EVA) on the moon. He is driving one of two core tubes into the lunar soil. Astronaut Neil A. Armstrong, commander, took this picture with a 70mm lunar surface camera. Aldrin stands near the Solar Wind Composition (SWC) experiment, a component of the Early Apollo Scientific Experiments Package (EASEP, deployed earlier). The SWC is in the center background.

Astronaut Edwin E. Aldrin Jr., wearing an Extravehicular Mobility Unit (EMU), verifies fit of the Portable Life Support System (PLSS) strap length during lunar surface training at the Kennedy Space Center. Aldrin is the prime crew lunar module pilot of the Apollo 11 lunar landing mission. Aldrin's PLSS backpack is attached to a lunar weight simulator.

AS11-40-5863 (20 July 1969) --- Astronaut Edwin E. Aldrin Jr., lunar module pilot, is photographed egressing the Lunar Module (LM) during the Apollo 11 extravehicular activity (EVA) on the moon. This photograph was taken by astronaut Neil A. Armstrong, commander, with a 70mm lunar surface camera. While astronauts Armstrong and Aldrin descended in the Lunar Module (LM) "Eagle" to explore the Sea of Tranquility region of the moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) "Columbia" in lunar orbit.

AS11-40-5948 (20 July 1969) --- Astronaut Edwin E. Aldrin Jr., lunar module pilot, is photographed during the Apollo 11 extravehicular activity (EVA) on the moon. He has just deployed the Early Apollo Scientific Experiments Package (EASEP). This is a good view of the deployed equipment. In the foreground is the Passive Seismic Experiment Package (PSEP); beyond it is the Laser Ranging Retro-Reflector (LR-3); in the center background is the United States flag; in the left background is the black and white lunar surface television camera; in the far right background is the Lunar Module (LM). Astronaut Neil A. Armstrong, commander, took this picture with a 70mm lunar surface camera. While astronauts Armstrong and Aldrin descended in the Lunar Module (LM) "Eagle" to explore the Sea of Tranquility region of the moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) "Columbia" in lunar orbit.

AS11-40-5875 (20 July 1969) --- Astronaut Edwin E. Aldrin Jr., lunar module pilot of the first lunar landing mission, poses for a photograph beside the deployed United States flag during an Apollo 11 extravehicular activity (EVA) on the lunar surface. The Lunar Module (LM) is on the left, and the footprints of the astronauts are clearly visible in the soil of the moon. Astronaut Neil A. Armstrong, commander, took this picture with a 70mm Hasselblad lunar surface camera. While astronauts Armstrong and Aldrin descended in the LM, the "Eagle", to explore the Sea of Tranquility region of the moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) "Columbia" in lunar orbit. Photo credit: NASA

AS11-40-5903 (20 July 1969) --- Astronaut Edwin E. Aldrin Jr., lunar module pilot, walks on the surface of the moon near the leg of the Lunar Module (LM) "Eagle" during the Apollo 11 extravehicular activity (EVA). Astronaut Neil A. Armstrong, commander, took this photograph with a 70mm lunar surface camera. While astronauts Armstrong and Aldrin descended in the Lunar Module (LM) "Eagle" to explore the Sea of Tranquility region of the moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) "Columbia" in lunar orbit.

AS11-40-5868 (20 July 1969) --- Astronaut Edwin E. Aldrin Jr., lunar module pilot, descends the steps of the Lunar Module (LM) ladder as he prepares to walk on the moon. He had just egressed the LM. This photograph was taken by astronaut Neil A. Armstrong, commander, with a 70mm lunar surface camera during the Apollo 11 extravehicular activity (EVA). While Armstrong and Aldrin descended in the LM "Eagle" to explore the moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) in lunar orbit.

Astronaut Neil A. Armstrong, commander of the Apollo 11 lunar landing mission, is photographed during thermovacuum training in Chamber B of the Space Environment Simulation Laboratory, Building 32, Manned Spacecraft Center. He is wearing an Extravehicular Mobility Unit. The training simulated lunar surface vacuum and thermal conditions during astronaut operations outside the Lunar Module on the moon's surface. The mirror was used to reflect solar light.

jsc2008e040725 - Panorama view of Apollo 11 Lunar surface photos taken by Astronaut Neil Armstrong at Tranquility Base of a crater Armstrong noted during the Lunar Module descent. The panoramas were built by combining Apollo 11 images starting with frame AS11-40-5954 through end frame AS11-40-5961. The panoramic images received minimal retouching by NASA imagery specialists, including the removal of lens flares that were problematic in stitching together the individual frames and blacking out the sky to the lunar horizon. These adjustments were made based on observations of the Moon walkers who reported that there are no stars visible in the sky due to the bright lunar surface reflection of the Sun.

View from the Apollo 11 Twentieth Anniversary Black Tie reception at the downtown Houston Hyatt Regency Hotel. Scene show NASA/JSC Director Aaron Cohen talking with NASA Administrator Richard H. Truly and his wife, Cody.

Physicist Brian Cox serves as the moderator for a panel discussion with Apollo astronauts during the Apollo 11 50th Gala on July 16, 2019. The gala, presented by Northrop Grumman, was held inside the Apollo/Saturn V Center at the Kennedy Space Center Visitor Complex. From left, are Apollo 9 astronaut Rusty Schweichart, Apollo 11 astronaut Michael Collins, Apollo 16 astronaut Charlie Duke, and Apollo Flight Director Gerry Griffin.

A panel discussion with Apollo astronauts took place during the Apollo 11 50th Gala, present by Northop Grumman, inside the Apollo/Saturn V Center at the Kennedy Space Center Visitor Complex in Florida on July 16, 2019. From left, are Apollo 9 astronaut Rusty Schweickart, Apollo 11 astronaut Michael Collins, Apollo 16 astronaut Charlie Duke, and Apollo Flight Director Gerry Griffin.

Andy Aldrin, son of Apollo 11 astronaut Buzz Aldrin, introduces Apollo 11 astronaut Michael Collins, during the Apollo 50th Gala, presented by Northrop Grumman. The event was held inside the Apollo/Saturn V Center at the Kennedy Space Center Visitor Complex in Florida on July 16, 2019.

S69-35505 (June 1969) --- The prime crews of the Apollo 10 lunar orbit mission and the Apollo 11 lunar landing mission are photographed during an Apollo 10 postflight de-briefing session. Clockwise, from left foreground, are astronauts Michael Collins, Apollo 11 command module pilot; Edwin E. Aldrin Jr., Apollo 11 lunar module pilot; Eugene A. Cernan, Apollo 10 lunar module pilot; Thomas P. Stafford, Apollo 10 commander; Neil A. Armstrong, Apollo 11 commander; and John W. Young, Apollo 10 command module pilot.

Retired NASA astronauts participate in a panel discussion during the Apollo 11 50th Gala, presented by Northrop Grumman, on July 16, 2019. The gala was held inside the Apollo/Saturn V Center at the Kennedy Space Center Visitor Complex in Florida. From left, are Apollo 11 astronaut Michael Collins, Apollo 16 astronaut Charlie Duke, and Apollo Flight Director Gerry Griffin.