Astronaut Tim Kopra, member of next shuttle crew, injured in bike mishap
The lead spacewalker for the next shuttle mission, the long-delayed last flight of Discovery, has apparently broken his hip in a bike accident. Key quote:
NASA does not train backup crews and a replacement, even a recently flown veteran, would need time to rehearse spacewalk scenarios and receive mission-specific training for Discovery’s flight. How long that might take, if required, and what impact it might have on the shuttle’s launch date is not yet known.