NASA marks 20 years since space shuttle Columbia disaster

This undated photo released in June 2003 provided by NASA shows STS-107 crew members aboard the Space Shuttle Columbia. On Feb. 1, 2003, the seven crew members were lost as the Columbia fell apart over East Texas. This picture was on a roll of unprocessed film later recovered by searchers from the debris. From the left (bottom row), wearing red shirts to signify their shift's color, are mission specialist Kalpana Chawla, commander, Rick D. Husband, mission commander Laurel B. Clark and Ilan Ramon, payload specialist. From the left (top row), wearing blue shirts, are mission specialist David M. Brown, pilot William C. McCool, pilot; and payload commander Michael P. Anderson. (NASA via AP, File) This undated photo released in June 2003 provided by NASA shows STS-107 crew members aboard the Space Shuttle Columbia. On Feb. 1, 2003, the seven crew members were lost as the Columbia fell apart over East Texas. This picture was on a roll of unprocessed film later recovered by searchers from the debris. From the left (bottom row), wearing red shirts to signify their shift's color, are mission specialist Kalpana Chawla, commander, Rick D. Husband, mission commander Laurel B. Clark and Ilan Ramon, payload specialist. From the left (top row), wearing blue shirts, are mission specialist David M. Brown, pilot William C. McCool, pilot; and payload commander Michael P. Anderson. (NASA via AP, File)

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