Trapped in space on a crippled shuttle — it's every astronaut's and NASA's worst nightmare. That's why, when the shuttle Atlantis goes to repair the Hubble space telescope this fall, NASA has a backup plan: STS-400, the ultimate "what if" scenario.
When NASA launches the Hubble repair mission, STS-125, astronauts won't come anywhere close to the safe haven the International Space Station provides if a shuttle cannot safely land. Instead, they'll be on their own in high Earth orbit. ...Full Story