The penultimate Moon mission, Apollo 16, almost didn't land. But a gutsy last-minute decision to go for it gave astronauts the chance to roam and sample the ancient lunar highlands, offering a window some 3.5 billion years into the Moon's past.
50 years ago, Apollo 16 astronauts Charlie Duke and John Young roved across the lunar highlands to study the Moon's geology. Here are the highlights of the mission in the astronauts' own words.
