Discovery Blazes One Last Trail

Just shy of 40 successful space journeys, the NASA shuttle Discovery headed to the International Space Station Thursday on a final mission that followed repair problems and bad weather. Known as "STS-133," Discovery's last voyage will take 11 days. The shuttle is delivering a variety of parts and modules to the space station and carrying an interesting hitchhiker -- a humanoid robot named "Robonaut 2," or "R2."

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