By MARCIA DUNN, AP Aerospace Writer
SPACE CENTER, Houston - In a numbing setback sure to set off a national debate over the future of the space program, NASA has grounded all future shuttle flights because of a large chunk of foam that broke off Discovery's fuel tank in hauntingly similar fashion to Columbia's doomed mission.
I applaud the space program as I do any exploration. I hope we can strike a balance between caution and pioneering spirit.
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