The Nation

Challenger was rolled to the Kennedy Space Center launch complex 39B two miles from where the Columbia is poised for a mission, the first time a pair of space shuttles have been on the launch pads at the same time. Columbia is on Pad 39A, grounded there because of a faulty power unit that aborted before liftoff Thursday. It has been rescheduled for Jan. 4, with Rep. Bill Nelson (D-Fla.) in the seven-man crew. Challenger is set to blast off Jan. 22, with the first space teacher, Christa McAuliffe of Concord, N.H., aboard.

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