American composer Michael Giacchino, left, and National Symphony Orchestra (NSO) conductor, Emil de Cou, wave to the audience during the "NSO 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)

Emil de Cou conducts the National Symphony Orchestra to a backdrop of Apollo 11 footage during the "NSO 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)

Emil de Cou conducts the National Symphony Orchestra to a backdrop of Apollo 11 images during the "NSO 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)

American composer Michael Giacchino's piece titled, "Advent" is performed 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)

NASA Associate Administrator for Communications, Bettina Inclan 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)

Maker and host of Savage Builds, Adam Savage, 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)

Pharrell gestures to the crowd after performing "Freedom" at 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)

Meredith Vieira 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)

Natasha Bedingfield performs 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)

Son of Apollo 11 astronaut Neil Armstrong, Mark Armstrong, right, and his daughter, sing a song he wrote about his father, "Flight of Fancy," 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)

Herbie Hancock performs 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)

LeVar Burton 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)

Author Charles Fishman speaks to maker and host of Savage Builds, Adam Savage, 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)

Maker and host of Savage Builds, Adam Savage, dressed in a spacesuit, speaks to the audience after planting a U.S. flag on the stage 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)

Son of Apollo 11 astronaut Neil Armstrong, Mark Armstrong, 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)

Herbie Hancock 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)

American composer Michael Giacchino 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)

Son of Apollo 11 astronaut Neil Armstrong, Mark Armstrong, right, and his daughter, sing a song he wrote about his father, "Flight of Fancy," 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)

NASA Associate Administrator for Communications, Bettina Inclan 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)

A new music video for David Bowie's "Space Oddity" is premiered 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)

Maker and host of Savage Builds, Adam Savage, dressed in a spacesuit, plants a U.S. flag on the stage 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)

Meredith Vieira 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)

Pharrell gestures to the crowd during his performance of "Freedom" at 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)

Meredith Vieira closes out the program by reading Walter Cronkite's speech during the "National Symphony Orchestra Pops, Apollo 11: A 50th Anniversary, One Small Step, One Giant Leap" which included 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)

All members of the program sing "America, the Beautiful" at the conclusion of the "National Symphony Orchestra Pops, Apollo 11: A 50th Anniversary, One Small Step, One Giant Leap" which included 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)