55 years ago today, on July 20, 1969, astronauts Neil Armstrong and Buzz Aldrin landed on the Moon in the lunar module “Eagle.” “Houston, Tranquility Base here, the Eagle has landed.” “That’s one small step for man, one giant leap for mankind.” -- Phrases that recall humanity’s first landing on the lunar surface. On that day, Apollo 11 astronauts Neil A. Armstrong, Michael Collins, and Edwin E. “Buzz” Aldrin, as a team, completed humanity’s first landing on the Moon and they fulfilled President John F. Kennedy’s national goal, set in May 1962, to land a man on the Moon and return him safely to Earth before the end of the decade. For many of us, that adventure is as fresh in our memories today, 55 years later, as if it happened just yesterday.