Fifty years after a mighty rocket set off from Florida carrying the first humans to the Moon, a veteran of the Apollo 11 crew returned to its fabled launch pad Tuesday to commemorate "one giant leap" that became a defining moment in human history.

'One giant leap': US marks Apollo mission 50 years on

'One small step for man, one giant leap for mankind': 50 years of historic Apollo 11 mission

On July 16, 1969, Apollo 11 lifted off from NASA's Kennedy Space Center in Florida, rocketing astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins into space. Watch this video to know more.

'One giant leap': 50 years since the first moon landing

Saturday marks 50 years since the historic first moon landing of 1969. On July 16, 1969, Apollo 11 lifted off from NASA's Kennedy Space Center in Florida, rocketing astronauts Neil Armstrong, Buzz Aldrin and Michael Collins into space. Four days later, on July 20, 1969, Armstrong and Aldrin landed Apollo 11's module, the Eagle, on the moon and stepped onto the lunar surface.

Timeline of space exploration 1969 - 2001

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'One giant leap': US marks Apollo mission 50 years on

'One small step for man, one giant leap for mankind': 50 years of historic Apollo 11 mission

'One giant leap': 50 years since the first moon landing

Timeline of space exploration 1969 - 2001