Who was the second man to walk on the moon?

When President Kennedy said on May 25, 1961, the United States would land a man on the moon and safely return by the end of the decade, many thought that was a completely unrealistic goal. However, on July 16, 1969 Apollo 11 launched from Cape Kennedy with Neil Armstrong, Michael Collins and Edwin "Buzz" Aldrin on their way to the moon.

On July 20, 1969, "The Eagle Has Landed" was heard at NASA's Mission Control in Houston and President Kennedy's bold prediction was a reality.

While Michael Collins piloted the Command Module, Armstrong piloted the Eagle (Lunar Lander), to a smooth landing in the Moon's Sea of Tranquility. About 4 hours later, the world heard the now famous phrase "That's one small step for a man, one giant leap for mankind" as Armstrong stepped from the Lunar Module onto the moon's surface. Aldrin followed about twenty minutes later.

Armstrong and Aldrin spent 21 hours, 36 minutes on the moon's surface.