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Roger Boisjoly

Morton Thiokol engineer Roger Boisjoly, appearing before the House Committee on Science and Technology, details his objections to the launch of space shuttle Challenger when he learned of freezing temperatures at Kennedy Space Center in Washington, June 17, 1986. (AP Photo/John Duricka)

Remembering the Challenger

The NASA lost seven of its own on the morning of

Jan. 28, 1986, when a booster engine failed, causing the Shuttle

Challenger to break apart just 73 seconds after launch. (Reuters)