NASA said Wednesday it is grounding future shuttle flights because foam debris that brought down Columbia is still a risk ? and might have doomed Discovery if the big chunk of broken insulation had come off just a bit earlier and slammed into the spacecraft.
A large chunk of foam flew off Discovery?s external fuel tank just two minutes after liftoff Tuesday morning. Shuttle managers do not believe it hit the shuttle, posing a threat to the seven astronauts when they return to Earth. But they plan a closer inspection of the spacecraft to be sure.
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