Apollo 17’s commander left a stirring message for the next astronauts headed for the moon

<p>The late Gene Cernan became the 11th person to walk on the moon in 1972 and was the last human to leave a footprint on its surface. In an unreleased clip from a 2013 documentary, Cernan left a message for future crews who planned to head out on a lunar mission.</p><p>(Mark Stewart Productions / Haviland Digital / Stopwatch Productions/ Directed by Mark Craig - 2013)</p>