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Officials with the U.S. space agency NASA have given final approval for next week's scheduled launch of the shuttle Discovery, despite concerns over a set of protective thermal tiles on the spacecraft's wings.
Shuttle program manager Wayne Hale says senior flight managers and engineers made the decision Tuesday after a long meeting. Hale says the evidence presented during the meeting shows an "acceptable risk to go fly."
An independent review board is urging NASA to replace three heat shield panels where inspectors found microscopic cracks on their external layers.
NASA has given extra attention to any damage to the shuttle's heat shield tiles. In 2003, a blow from a piece of foam led to the fiery disintegration of the space shuttle Columbia as it re-entered Earth's atmosphere, killing all seven astronauts on board.
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