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Shuttle Countdown Begins

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Associated Press

The countdown began today for a complex space shuttle science mission that will start with the liftoff of Challenger on Friday. The seven astronauts who will operate a $72-million array of scientific instruments flew here Tuesday from their training base in Houston to make final preparations for seven days of star-gazing in orbit. Challenger is to return to Earth on July 19, landing at Edwards Air Force Base, Calif.

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