RETURN TO FLIGHT: FIXING THE SPACE SHUTTLEDiscovery ChannelMay 15, 2005 8pm ET1x90 min. doc./realityIn the skies over Texas, the space shuttle Columbia and the seven heroic astronauts on board fall helplessly to the earth in a shower of hot metal. In an instant, the powerful symbol of technological achievement and national pride is reduced to thousands of pieces of smoldering debris. And somewhere among the wreckage lies the uncertain future of human space exploration.