As astronauts know better than anyone else, risks, incidents, and mishaps are inevitable in the development of any high-performance vehicle. The emergence of supersonic flight during the 1940s and of the Century Series of fighters in the 1950s came with the loss of several test pilots. Still, it was a glorious time.

Did I think about the risks? Of course I did. Anyone who says otherwise is not being completely honest. The amount of energy it takes to bring a spacecraft to orbital speed, and the forces it endures on re-entry, makes risk impossible to avoid.

In order to do anything worthwhile, one must take calculated risks.

Leroy Chiao Quotes