A screen stands during the memorial service for astronaut Neil Armstrong is held at the National Cathedral September 13, 2012. (Photo by Chip Somodevilla/Getty Images)

Apollo astronaut and the last man to walk on the Moon, Eugene Cernan, delivers remarks about his friend and Apollo 11 astronaut Neil Armstrong (Photo by Chip Somodevilla/Getty Images)

NASA Administrator Charles Bolden delivers a tribute during a memorial service celebrating the life of Neil Armstrong, Thursday, Sept. 13, 2012, at the Washington National Cathedral. Armstrong, the first man to walk on the moon during the 1969 Apollo 11 mission, died Saturday, Aug. 25. He was 82.

(NASA/Bill Ingalls)

Carol Armstrong, center, her son Eric, right, and daughter Molly Van Wagenen hold their hands to their hearts during a memorial service celebrating the life of Neil Armstrong at the Washington National Cathedral, Thursday, Sept.13, 2012. Armstrong, the first man to walk on the moon during the 1969 Apollo 11 mission, died Saturday, Aug. 25. He was 82.

(NASA/Bill Ingalls)

The memorial service for Neil Armstrong at the Washington National Cathedral in Washington, D.C. on Sept. 13, 2012.

(L-R) Christin Korp, Apollo 11 astronaut Buzz Aldrin, Annie Glenn and astronaut and former U.S. Senator John Glenn (D-OH) visit before the memorial service for astronaut Neil Armstrong at the National Cathedral September 13, 2012 in Washington, DC. (Photo by Chip Somodevilla/Getty Images)

Members of the Navy at Neil Armstrong's memorial service in Washington, D.C., Thursday.

Apollo 17 mission commander Eugene Cernan speaks at Neil Armstrong's memorial service.

Jazz singer Diana Krall performs at the memorial service for Neil Armstrong on Sept. 13, 2012.

Attendees at the memorial service for Neil Armstrong in the Washington National Cathedral Thursday.

A choir sings during the Neil Armstrong memorial service in Washington, D.C. Thursday.

The service honoring Neil Armstrong in the Washington National Cathedral Thursday.