NASA commemorates 50 years since the launch of the Apollo 11 Mission ...

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On July 21, 1969, astronauts Neil Armstrong and Buzz Aldrin were the first men to set foot on the moon....

Apollo 11 astronaut Michael Collins returned Tuesday to the exact spot where he flew to the moon 50 years ago with Neil Armstrong and Buzz Aldrin. Collins had the spotlight to himself this time — Armstrong has been gone for seven years and Aldrin canceled. Collins said he wished his two moonwalking colleagues could have shared the moment at Kennedy Space Center's Launch Complex 39A, the departure point for humanity's first moon landing. "Wonderful feeling to be back," the 88-year-old command module pilot said on NASA TV. "There's a difference this time. I want to turn and ask Neil a question and maybe tell Buzz Aldrin something, and of course, I'm here by myself." At NASA's invitation, Collins marked the precise moment — 9:32 a.m. on July 16, 1969 — that the Saturn V rocket blasted off. He was seated at the base of the pad alongside Kennedy's director, Robert Cabana, a former space shuttle commander. Collins recalled the tension surrounding the crew that day. "Apollo 11 ... was serious business. We, crew, felt the weight of the world on our shoulders. We knew that everyone would be looking at us, friend or foe, and we wanted to do the best we possibly could," he said. Collins remained in lunar orbit, tending to Columbia, the mother ship, while Armstrong and Aldrin landed in the Eagle on July 20, 1969, and spent 2 ½ hours walking the gray, dusty lunar surface. A reunion Tuesday at the Kennedy firing room by past and present launch controllers — and Collins' return to the pad, now leased to SpaceX — kicked off a week of celebrations marking each day of Apollo 11's eight-day voyage.