In Chris Hadfield's 'The Darkest Dark,' a Future Astronaut Faces His Deepest Fears

Retired Canadian astronaut Chris Hadfield wrote "The Darkest Dark" to show a younger audience what it's like to face their fears. The first moonwalkers were a strong inspiration for Hadfield, who has commanded the International Space Station and flown on three space missions. "I served as an astronaut for 21 years, and I spoke in — gosh, I've lost count of the number of schools over those 21 years," Hadfield told Space.com.

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