Shuttle Investigation

NPR's Richard Harris reports that the NASA investigation into Saturday's disintegration of the space shuttle Columbia is concentrating more closely on the landing gear compartment in the aircraft's left wing. There's increasing evidence that the problem started there. Before the spacecraft came apart, the left side of the shuttle, adjoining the wing, heated up by an alarming 60 degrees over a few minutes. The wheel well where the landing gear is stored during flight is especially vulnerable to heat.

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