As an astronaut, especially during launch, half of... -Chris Hadfield

As an astronaut, especially during launch, half of the risk of a six-month flight is in the first nine minutes.

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Alan Bean , Alan G. Poindexter , Alan Shepard , Andrew J. Feustel , Anne McClain , Buzz Aldrin , Charles Duke
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Retired Canadian astronaut and engineer, the first Canadian to command the International Space Station (ISS).