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Shuttle disintegrates, 7 astronauts dead
One year after the space shuttle Columbia broke up over Texas, NASA remembered the seven fallen astronauts aboard and reasserted the need for accuracy, safety and communication as the space program moved forward. NASA chief Sean O'Keefe has admitted the agency "flat missed" the accident's cause -- foam that hit the shuttle's wing shortly after liftoff. A post-crash report called for significant cultural and "structural changes" at NASA.

NASA aims higher | Report faults NASA culture | PDF
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