Fifty-two years ago this week the world watched in fascination, as Apollo 11 astronauts Neil Armstrong and Buzz Aldrin became the first human beings to set foot on the surface of the moon.

As they were planting their footprints on the moon, orbiting above it was the third member of the history-making crew, Michael Collins. 

After all, someone had to stay in the car with the motor running while Armstrong and Aldrin did their thing. 

More than 20 years later, I met and interviewed Mike Collins. Twice, in fact. The interview you're going to here was the second one we did, about a book he wrote called Missino to Mars