"To my knowledge he has done two television interviews in the last 40 years - and he says nothing about what he felt about anything. He will talk about matters of fact and that's it," says Smith. The author has been repeatedly refused an interview with Armstrong despite many requests, although the pair have had e-mail correspondence.
"And he didn't want to profit from it financially - even though a lot of the other Moon walkers have done - and amazingly he's stood by that. An auction house told me that if Armstrong spent just one afternoon signing autographs he could make a million dollars, but he's always refused."
"The music he took on the mission to the Moon was deeply eccentric," says Smith. "Most astronauts took one classical piece, and one country and western.
"Armstrong took Dvorak's New World Symphony. But the other was theremin music - that eerie, wavy sound associated with sci-fi movies that goes 'woo woo'. On one hand it was the most perfect thing he could take, on the other it is massively eccentric - and that's kind of him."