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FILE - In this Sept. 13, 1985 file photo, Christa McAuliffe tries out the commander's seat on the flight deck of a shuttle simulator at the Johnson Space Center in Houston, Texas. Thirty-two years after the Challenger disaster, a pair of teachers turned astronauts on the International Space Station will pay tribute to McAuliffe by carrying out her science classes. (AP Photo)

FILE - In this Sept. 13, 1985 file photo, Christa McAuliffe tries out the commander's seat on the flight deck of a shuttle simulator at the Johnson Space Center in Houston, Texas. Thirty-two years after the Challenger disaster, a pair of teachers turned astronauts on the International Space Station will pay tribute to McAuliffe by carrying out her science classes. (AP Photo)

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