After what they called a "spirited discussion," NASA officials decided Saturday to launch the space shuttle Discovery as planned on July 1. It will be only the second flight since the Columbia tragedy.

Concluding a two-day meeting at the Kennedy Space Center in Florida that Michael D. Griffin, administrator of the National Aeronautics and Space Administration, said involved "intensive and spirited exchange" over safety issues, shuttle authorities gave a go-ahead to the flight despite the reservations of two senior officials.

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