Mourners left a makeshift memorial outside NASA's Johnson Space Center in Houston after the Columbia disaster on Feb. 1, 2003.
Brett Coomer/Getty Images
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Seven astronauts died when the Space Shuttle Columbia disintegrated upon reentry on Feb. 1, 2003. NASA Deputy Administrator Pam Melroy looks back on the tragedy and how it shaped the agency.
Mourners left a makeshift memorial outside NASA's Johnson Space Center in Houston after the Columbia disaster on Feb. 1, 2003.
Brett Coomer/Getty Images
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